Showing posts with label Life on Mars. Show all posts
Showing posts with label Life on Mars. Show all posts

Sunday, August 19, 2012

Impossible, Improbable & Imaginary Extraterrestrial Geographies

Far away places with strange sounding names. Sometimes they exist; sometimes they exist but not quite in the way at times suspected or expected; sometimes they don’t exist at all. It’s the latter two categories I examine here.

Impossible, improbable or imaginary geographies are often located, as things turned out, off planet. Here are a few examples of those impossible, improbable & imaginary extraterrestrial geographies.

Vulcan: We all know that Mercury is the closest planetary object to the Sun. But that’s not celestial physics set in stone. There could be objects even closer in, though difficult to see in the intense glare of our parent star, just as many of us haven’t ever seen Mercury being too close to the Sun to be seen with the unaided eye unless conditions are absolutely spot-on. So, way back when, when astronomical instrumentation and technology wasn’t as good as today, coupled with expectations and the thrill of the chase, well it’s not too surprising that astronomers ‘found’ that there was a planet even closer to the Sun than Mercury. Such a planet would be hot property indeed, and so when looking for mythological names that were ‘hot’ with which to christen it, well Vulcan fit the bill. And so it came to pass that Vulcan was the planet closest to the Sun; Mercury relegated to next in line. Unfortunately, they were wrong. Wishful thinking trumped less than ideal observations and so Vulcan was created in the mind as opposed to being actually verifiable. Mercury was restored to first rock from the Sun status – Vulcan became imaginary real estate. But, as Star Trek fans all know, the name lives on as the (non-solar) home of Mr. Spock and kin. 

Neith: Venus, the Goddess of Love, should have a lover – a companion. Venus, the planet, should too have a companion. After all, Venus is the near twin of Earth in terms of size and proximity to the Sun (Venus is second rock out), and Earth has a natural satellite so it stood to reason that Venus should have one too. Alas, it was not to be, but not for lack of trying. Take Neith – companion (but in mythology not lover) to Venus the planet. As with the case of Vulcan, wishful thinking, plus perhaps less than ideal telescopes (relative to modern scopes) led to a flurry of sightings of that expected satellite of Venus, named Neith, so confident were the discoverers that this was no illusion but a physical object. Now there’s a slight problem here. Venus isn’t that close in proximity to the Sun that solar glare should have caused problems. It wasn’t just one professional astronomer who sighted Neith, but many. And while the optical equipment of the day wasn’t 2012 state-of-the-art, it was more than adequate, or should have been more than adequate, to see a reasonable sized satellite in orbit around Venus. So, one could argue that Neith was indeed an actual bit of celestial real estate that went walkabout. Natural satellites don’t have a habit of going walkabout and disappearing. Unnatural satellites on the other hand… Now, might our own Moon be such an unnatural satellite?

Spaceship Moon: Once upon a time there was no real scientifically satisfactorily explanation for the Moon, or rather how the Moon came to be our Moon. One idea that the Moon was an independent body in an irregular and rogue orbit that somehow in a just-so kind of way happen to get gravitationally captured by the Earth was really too implausible. The Moon could have formed jointly with the Earth out of the same cosmic interstellar dust cloud that gave rise to the rest of the solar system. Some bits of that cosmic dust clumped together to form the planets around the parent star, the Sun, and in like fashion other bits of that dust came together around the planets to form natural satellites. Alas, post Apollo, chemical analysis of Moon bits compared to Earth bits ruled that out. For a similar reason, as well as problems in celestial physics, the Moon wasn’t born of a rapidly spinning proto-Earth leaving behind the Pacific basin as its scar, in the same way water droplets would be flung off a globe that was rapidly spinning.

Enter stage left the far-out-star-scout alternative idea that the Moon had nothing to do with the proto-Sun and proto-solar system and proto-Earth. The Moon wasn’t a rogue object captured by the Earth’s gravity, but it was a rouge object that was deliberately steered into an Earth orbit. The Moon was actually a hollow artificially constructed spaceship, covered with lots of dust and rock debris as a natural shield against cosmic radiation and other cosmic bits that would now and again slam into this spaceship – hazards of an interstellar voyage. Anomalies like Transient Lunar Phenomena (strange glowing lights seen on an irregular basis on the lunar surface) are explained as artificial. The Moon’s aliens are the source of the UFO phenomenon. The reason for the aliens steering the artificial Moon into Earth orbit in the first place is that Earth provided all the close at hand next door resources the aliens could ever want.

Of course to spoil that good artificial hollow Moon theory, some bright scientist comes up with yet another natural lunar origin explanation that now fitted all of the facts – a rogue near Mars-sized planet slammed, albeit just a glancing blow, into the proto-Earth, and the resulting mixture of thrown off debris from the proto-Earth and the near totally destroyed smaller rouge planet came together under gravity in near Earth proximity to become, the Moon. So, alas, the artificial hollow Moon proved to be another bit of implausible geography.

Face on Mars: The ‘is there or isn’t there life on Mars’ game was set afoot when the American Viking space probes arrived in the Martian arena in 1976. On the scale of micro-organisms, that question still hasn’t been resolved. There are those who are convinced the Viking craft that landed on the Martian surface hit biological pay dirt. Most others say it was only chemical, not biochemical pay dirt. The fence is being sat on by others to this day. However, the other Viking craft that orbited Mars boldly detected not microbial life, but intelligent life on Mars. One photographed the ‘face on Mars’, and by Jove, that’s exactly what it looked like – one huge monolithic massive stone structure on the Martian surface that resembled down to exacting details, a human face. Well, appearances can be, and often are, deceiving. All of us, at one time or another has seen geometry and recognizable shapes, including faces, in the clouds or in rock formations or on toasted cheese sandwiches. Images of ‘Jesus’ appearing on all manner of things are regular fodder for the tabloids.  Anyway, the whole ‘face on Mars’ issue spawned an entire mini publishing boom, though sceptics were 99 & 44/100’s % convinced that it was all just an illusion. And so it came to pass that NASA went back to Mars post-Viking, and, under pressure, had a new orbiting probe take another look under differing lighting conditions. The score – sceptics one; ‘face on Mars’ advocates zero. It really was all just an illusion, a trick of those lighting conditions that when coupled with some wishful thinking produced another example of imaginary geography.     

Hollow Moons of Mars: But wait, we’re not quite through with Mars yet. Mars has two relatively tiny satellites discovered in 1877 and both named after offspring of Ares/Mars – the god of war - that orbit around it. The one farther out and smaller of the two is called Deimos (about 4 miles radius and over 12,400 miles altitude) and the other larger and closer moon is Phobos (about 7 miles radius; altitude 3700 miles from the Martian surface). Actually it would be more accurate to say that neither is a perfect sphere; potato-shaped is a more spot-on description.

Now it came to pass that some scientists monitoring the relative orbits of Deimos and Phobos noticed that they were shrinking much, much, faster that they should have been. The moons were spiralling in towards the planet, eventually destined to have a close encounter of the Ka-Boom impact kind. The very tenuous Martian atmosphere isn’t much of a drag to what must be solid rock moons. The only alterative explanation is that these satellites were hollow; much less dense than solid rock, and therefore, wait for it, artificial, probably relics of a long extinct Martian civilization. Well actually, there was another alternative explanation – the observations of the shrinking orbits were at the limits of resolution technology and were erroneous. Space probes that have since passed up-close-and-personal to and photographed these satellites, and show exactly what you’d expect – not gleaming metallic hollow space stations or the image of a Star Wars type of Death Star configuration, but irregular, potato-shaped, cratered hunks of rock.

Heaven: If you accept the literal truth of Biblical passages, you can draw no other conclusion other than that Heaven is a physical place not of this Earth since there are lots of passages relating beings ascending and descending twixt the two. Therefore Heaven must be located somewhere up there or out there and as the Bible points out, home to an assorted range of supernatural deities (Father, Son and Holy Ghost) and staff, presumably angels (or extraterrestrial officers and crew depending on point of view). Unfortunately, despite Heaven being physical geography, it ain’t been seen by man, telescope or space probe. Heaven would have to be fairly conspicuous – deities and staff don’t reside on a quarter acre block. Try something more like the Taj Mahal or Buckingham Palace or Angkor Wat all cubed.

Of course perhaps Heaven is located light-years away among the stars, but that would hinder rapid interventions by the Heavenly residents here on Terra Firma. Prayers can’t travel faster than the speed of light, and like radio broadcasts, rapidly fade according to the inverse-square law – twice the distance, one-quarter the strength; thrice the distance, one-ninth the strength, etc. So, Heaven, if it makes any sense at all, should be nearby, in cosmic terms. Maybe Heaven resides and is hidden within the cloud bands of Jupiter, though that’s hardly a tranquil or ideal location as is in fact most of the solar system’s real estate. Of course if Heaven were a spaceship, a large spaceship – think Buckingham Palace cubed again – well perhaps that explains Neith. It just moved from the Venus environs to a less conspicuous location like in the asteroid belt or within the rings of Saturn - hidden in plain sight as it were. The upshot is, until proven otherwise, Heaven must be considered a mythical place.

Perhaps we all should be satisfied with the geography we got for real, keeping in mind that the geography we know is but a tiny, tiny, tiny, tiny (repeat several hundred more times) of the geography yet to be discovered and explored – the vast cosmos beckons.

Monday, October 17, 2011

Exobiology: Bibliography: Part Two

Exobiology was the original term given to the sciences central to the question of life-in-the-Universe. It’s now been largely replaced by Astrobiology, but I’ll stick with the original. To investigate life-in-the-Universe one needs a solid grounding in the relevant literature. A comprehensive relevant bibliography would run to many thousands of pages and be rather off-putting. So, perhaps something on a slightly smaller scale might be more in order to help the novice get started. 

For something that doesn’t yet exist, extraterrestrial life, intelligent or otherwise, has hatched a massive amount of literature, both technical and popular, in English and otherwise. There are speculative books, articles, documentaries, etc. that number in the tens of thousands. Add the sci-fi contributions into the mix, and you have tens of thousands more entries. Here are just a few more samplings of some of the non-fictional monographs that have touched on some of the topics raised so far.

Further Readings: Intelligent Life on the Moon

Leonard, George H.; Somebody Else Is On the Moon; David McKay Company, Inc., New York; 1976: 

Wilson, Don; Our Mysterious Spaceship Moon; Dell, Publishing Co., Inc., New York; 1975: 

Wilson, Don; Secrets of Our Spaceship Moon; Sphere Books Limited, London; 1980:

Further Readings: Our Solar System

Brack, Andre & Clancy, Paul & Horneck, Gerda; Looking for Life, Searching the Solar System; Cambridge University Press, New York; 2005: 

Carle, Glenn C. & Huntington, Judith L. & Schwartz, Deborah E. (Editors); Exobiology in Solar System Exploration; NASA SP 512; U.S. Government Printing Office, Washington, D.C.; 1992:

Horowitz, Norman H.; To Utopia and Back: The Search for Life in the Solar System; W.H. Freeman and Company, New York; 1986: 

Ponnamperuma, Cyril (Editor); Chemical Evolution of the Giant Planets; Academic Press, Inc., New York; 1976:


Further Readings: Mars

DiGregorio, Barry E. & Levin, Gilbert V. & Straat, Patricia Ann; Mars: The Living Planet; Frog, Ltd., Berkeley, California; 1997: 

Goldsmith, Donald; The Hunt for Life on Mars; Dutton, New York; 1997:

Sawyer, Kathy; The Rock from Mars: A Detective Story on Two Planets; Random House, New York; 2006:


Further Readings: Intelligent Life on Mars

Carlotto, Mark J.; The Martian Enigmas: A Closer Look; North Atlantic Books, Berkeley, California; 1991: 

Hoagland, Richard C.; The Monuments of Mars: A City On the Edge of Forever; North Atlantic Books, Berkeley, California; 1987:

Further Readings: Europa & Titan

Greenberg, Richard; Europa, the Ocean Moon: Search for an Alien Biosphere for Life on Jupiter’s Ocean Moon; Springer- Praxis Books, New York; 2005:

Greenberg, Richard; Unmasking Europa: The Search for Life on Jupiter’s Ocean Moon; Copernicus Books/Praxis Publishing Ltd, New York; 2008:

Lorenz, Ralph & Mitton, Jacqueline; Titan Unveiled: Saturn’s Mysterious Moon Explored; Princeton University Press, Princeton, New Jersey; 2008:
Further Readings: The Rare Earth Hypothesis

Brownlee, Donald & Ward, Peter D.; Rare Earth: Why Complex Life Is Uncommon in the Universe; Copernicus Books, New York; 2000:


Further Readings: Extraterrestrial Intelligence

Gould, Stephen Jay; Wonderful Life: The Burgess Shale and the Nature of History; Vintage, London: 2000: 

Morris, Simon Conway; The Crucible of Creation; Oxford University Press, New York; 1998:

Morris, Simon Conway; Life’s Solution: Inevitable Humans In A Lonely Universe; Cambridge University Press, New York; 2003:

Seielstad, George A.; At the Heart of the Web: The Inevitable Genesis of Intelligent Life; Harcourt Brace Jovanovich, Publishers, Boston; 1989:


Further Readings: SETI

Davies, Paul; The Eerie Silence: Are We Alone in the Universe?;
Allen Lane, London
; 2010:

Drake, Frank & Sobel, Dava; Is Anyone Out There? The Scientific Search for Extraterrestrial Intelligence; Delacorte Press; New York; 1992: 

McConnell, Brian; Beyond Contact: A Guide to SETI and Communicating with Alien Civilizations; O’Reilly & Associates, Sebastopol, California; 2001:

McDonough, Thomas R.; The Search for Extraterrestrial Intelligence: Listening for Life in the Cosmos; John Wiley & Sons, Inc., New York; 1987:

SETI Institute Science & Technology Working Group; SETI 2020: A Roadmap for the Search for Extraterrestrial Intelligence; SETI Press, Mountain View, California; 2002:

Shostak, Seth; Confessions of An Alien Hunter: A Scientist’s Search for Extraterrestrial Intelligence; National Geographic, Washington, D.C.; 2009:

Further Readings: Exploration and Colonization of Interstellar Space

Gilster, Paul; Centauri Dreams: Imagining and Planning Interstellar Exploration; Copernicus Books, New York; 2004:

Macvey, John W.; Interstellar Travel: Past, Present, and Future; Stein and Day, New York; 1977:

Further Readings:  The Fermi Paradox

Hart, Michael H. & Zuckerman, Ben (Editors); Extraterrestrials: Where Are They?; Pergamon Press, N.Y.; 1982:

Hart, Michael H. & Zuckerman, Ben (Editors); Extraterrestrials: Where Are They? [2nd edition]; Cambridge University Press, Cambridge; 1995:

Verma, Surendra; Why Aren’t They Here? The Question of Life on Other Worlds; Icon Books, Cambridge; 2007:

Webb, Stephen; Where Is Everybody? Fifty Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life; Copernicus Books, N.Y.; 2002:
Further Readings: Ancient Astronauts

Blumrich, Josef F.; The Spaceships of Ezekiel; Bantam Books, New York; 1974: 

Castle, Edgar W. & Thiering, Barry B. (Joint Editors); Some Trust in Chariots!!; Westbooks, Perth, W.A.; 1972:

Daniken, Erich von; Chariots of the Gods? Unsolved Mysteries of the Past; G.P. Putnam’s Sons, New York; 1969:

Daniken, Erich von; Gods from Outer Space: Return to the Stars or Evidence for the Impossible; G.P. Putnam’s Sons, New York; 1971:

Daniken, Erich von; In Search of Ancient Gods: My Pictorial Evidence for the Impossible; Souvenir Press, London; 1974:

Downing, Barry H.; The Bible & Flying Saucers; Avon Books, New York; 1968:

Drake, W. Raymond; Gods and Spacemen in the Ancient East; Sphere Books, London; 1974:

Drake, W. Raymond; Gods and Spacemen in the Ancient West; Sphere Books, London; 1974:

Norman, Eric; Gods Demons and UFOs; Lancer Books, New York; 1970:

Story, Ronald; Guardians of the Universe?; New English Library, London; 1980: 

Story, Ronald; The Space-Gods Revealed: A Close Look at the Theories of Erich von Daniken; Harper & Row, New York; 1976: 

Temple, Robert K.G.; The Sirius Mystery; Sidgwick & Jackson, London; 1976:

Wilson, Clifford; Crash Go the Chariots; Lancer Books, New York; 1972:

Wilson, Clifford; The Chariots Still Crash; Signet, New York; 1975:

Wilson, Clifford; The War of the Chariots; S. John Bacon, Melbourne, Victoria; 1978:

Saturday, September 3, 2011

Exobiology: Intelligent Life in the Solar System

Exobiology was the original term given to the sciences central to the question of life-in-the-Universe. It’s now been largely replaced by Astrobiology, but I’ll stick with the original. To investigate life-in-the-Universe perhaps we should start a bit closer to home and look to our own solar system. Apart from Planet Earth, we have no absolute proof positive to date that any simple life (i.e. – microbes), exists within the confines of our solar system. But what of intelligent life?

Over the years, there have been some speculations that our solar system plays host to advanced intelligent extraterrestrial beings.

The Moon (Luna): The Hollow and Inhabited Moon Theory: Once upon a time, not all that long ago in fact, there really wasn’t a satisfactory scientific explanation for the natural origin of our satellite, Luna. All the three major theories had fatal flaws. And thus, the possibility that the Moon wasn’t natural at all, but some sort of hollow world, perhaps a UFO base and colony ship, wasn’t all that implausible to some. However, some scientific genius came up with a fourth natural explanation that satisfied all the previous scientific stumbling blocks. Thus, using Ockham’s (or Occam’s) Razor as a guide, me-thinks the hollow Moon theory has proved to be a bit, well, hollow. Pity! However, if UFOs should prove to be space vehicles, the products of alien intelligence, then it logically follows that E.T. will have explored our Moon, maybe even have a base of operations there. That might account for part of the various Transient Lunar Phenomena (TLP) witnessed over many centuries.

The Moons of Mars: For a brief while there was some serious scientific speculation that the tiny twin Martian satellites, Deimos and Phobos, were, based on their orbital characteristics, hollow, and thus artificial. Well, close-up photography has put that to rest. It was the observations that were out of kilter, not the actual orbits of the Martian moons. 

The Face on Mars: An apparently gigantic ‘human’ face was photographed by the Viking Orbiting spacecraft. Alas, however wonderful this would have proved to have been, an obvious alien artefact, it really was just a mirage – a trick of light and shadow as shown by later photographs from other orbiting Mars spacecraft. It proved to be a case of wishful thinking, like the canals of Mars were, and a case of a mountain made unnecessarily out of a molehill.

The Search for ExtraTerrestrial Intelligence (SETI) hasn’t just focused on trying to detect artificial radio transmissions from E.T. There have been searches of the asteroid belt for obvious signs of astro-engineering (like aliens mining the asteroids for the resources they contain). No luck. There’s also been searches made of the Earth-Moon Lagrangian points – those areas of space where an object can ‘hover’ indefinitely in a fixed position relative to both the Earth and the Moon – sort of like being in geostationary orbit. Anyway, searches have been done at those locations for obvious alien relics or ships, but again, no dice.

I can’t quite leave this area without making reference to that way far out sub-genre of UFO buffs from the 1950s (their heyday) – the contactees. The contactees claimed to have had personal contact with and messages from angelic-like extraterrestrial beings, often called by the contactees our ‘space brothers’ who have come to Earth in their ‘flying saucers’. 

The contactees were often bucketed as total loonies back then (in the 50’s) by the mainstream, even mainstream people interested in extraterrestrial life and UFOs. That’s no less so today if someone is still foolish enough to mention them. But a question remains on the grounds of ‘innocent until proven guilty’ - and none of the contactees were ever convicted and imprisoned for outright fraud. But did the contactees (collectively) invent these angelic-like extraterrestrial beings with the intent of fraud; or to have some fun and hoax the public and pull the wool over their unsuspecting eyes; or perhaps they just, collectively, had some serious mental issues, say delusions of sorts. Or, perhaps the contactees were relating the truth as they thought they had experienced it, when perhaps the angelic-like extraterrestrial beings were being less than 100% honest with them.

In any event, the contactees spun the tale that these angelic-like ‘space brothers’ came from the other planets and bodies in our solar system (some we haven’t even discovered yet). Our Moon, Venus, Saturn, etc. were all home to these advanced extraterrestrials. The contactees rode in the ‘space brothers’ ‘flying saucers’ and visited their planetary homes, however preposterous that seemed back even then. Although then again, you have that angelic-like ancient Near Eastern goddess Inanna or Inana (Ishtar) identified with the celestial planet Venus, so who knows where the ‘gods’ have actually set up camp! Venus might be pure fire-and-brimstone hell to us, but then too we, using our technology, can survive in environments previously lethal to us – say under the sea or on the Antarctic icecap.

Just because there’s no obvious evidence of extraterrestrial intelligence in our solar system now doesn’t mean there wasn’t in the past, or of course they could be here now, hiding in plain sight – those pesky UFO events!


Friday, September 2, 2011

Exobiology: Life in the Solar System: Summary & Conclusions

Exobiology was the original term given to the sciences central to the question of life-in-the-Universe. It’s now been largely replaced by Astrobiology, but I’ll stick with the original. To investigate life-in-the-Universe perhaps we should start a bit closer to home and look to our own solar system. Apart from Planet Earth, we have no absolute proof positive to date that any other life, albeit relatively simple forms compared to terrestrial life forms such as ourselves and associated companion animals and plants, exists within the confines of our solar system. However, I conclude in this overall summary the odds are fairly high, almost certain in fact; those other, albeit relatively simple extraterrestrial life forms do exist in our immediate cosmic neighbourhood. 


Life is ultimately nothing more than an ongoing series of complex biochemical reactions. These sort of reactions tend to be optimal at warmer (quasi Earth-like) temperatures. Too cold and the necessary chemical reactions are too sluggish, if they proceed at all. Too hot, complex organic molecules rapidly break down. So, Titan (moon of Saturn) is probably way too chilly even though it has a thick atmosphere and lots of organic molecules on the surface, even organic liquids forming large lakes if not exactly oceans. The surface of Venus in contrast is way too hot, but it has a thick atmosphere that’s a lot more temperate at higher altitudes. Some real estate is both too hot and too cold at the same time – Mercury and Luna (our Moon) for example and lacking any real atmosphere and liquid water aren’t top of the pops for finding life, however simple.

Mars, long associated with intelligent extraterrestrial life, is still a near certainty for much housing far simpler extraterrestrial life forms, like microbes. There are many independent chains of observational evidence that support that conclusion. Proof positive however, still waits.

Europa (moon of Jupiter) has in all probability a liquid water ocean beneath a global ice cap. Water plus a geothermal/tidal energy heat source opens up a good plausibility for going ice fishing to our descendents several generations down the track. There are several other moons with ice cap surfaces covering possible liquid oceans that might rival Europa as an eventual fishing destination.

My favourite solar system locations for (probably) tough-as-nails microbial life, Mars apart, are the upper atmospheres of the Jovian (gas giant) planets (Jupiter and Saturn; maybe Uranus and Neptune). Their atmospheres are rich in organics and no doubt water vapour.  The gas giants, Uranus excepted, radiate more heat energy than they receive from the Sun. There will be regions in their upper atmospheres that have Earth-like temperatures; there will be a lot of atmospheric mixing (useful for bringing different chemicals together); and of course these planets will also have been seeded with organics and water from space via comets, meteors, cosmic dust, etc., if not in fact seeded directly with microbial life forms via the Panspermia hypothesis.

The problem in finding out for sure is going to revolve around sending appropriate instrumentation into those planetary atmospheres that will be able to detect actual life forms, as opposed to just measuring just purely physical parameters and chemical constituents. So, don’t expect definite answers anytime soon.  

Lastly, we can’t rule out comets and meteors from housing dormant extraterrestrial microbial life forms.


Tuesday, August 30, 2011

Exobiology: Life In The Inner Solar System: Mars

Exobiology was the original term given to the sciences central to the question of life-in-the-Universe. It’s now been largely replaced by Astrobiology, but I’ll stick with the original. To investigate life-in-the-Universe one also needs to look for life within our own solar system, apart from Earth of course. Take Mars, fourth rock from the Sun.  There is (microbial) life on Mars. Microbial life on the Red Planet Mars is just about a sure fire a thing as death and taxes, albeit it’s probably spread very thinly.

Firstly, the two Viking landers, equipped with three separate life detection experimental techniques, all scored positive hits. It was only because the detection of organic molecules proved negative that it was thought prudent to look at exotic inorganic soil chemistry as an alternative explanation for the positive life detection results. There are those scientists involved with those Viking experiments who still maintain that microbial life was detected on Mars in 1976. Certainly it’s not 100% proof, but it’s certainly a pro-life run on the scoreboard.

Secondly, there is the evidence from the Martian meteorite found in the Antarctic (ALH 84001). Recall there was four separate and independent reasons for coming to the conclusion that the meteorite contained fossil microbial life forms from Mars. While each apart could have a non-biological explanation, the four together were highly suggestive of microbial life on Mars. Make that two runs on the scoreboard.

Thirdly, spacecraft orbiting Mars have detected methane in the Martian atmosphere. Methane is chemically reactive, and would disappear in short time frames were it not replenished by some source. A major source of methane on Earth is from microorganisms. While there are non-living sources of methane (volcanic activity), lack of such activity on Mars suggests that one chalk up yet another run on the board for life.

Fourthly, there’s no longer any question about Mars once having had extensive water. Spirit and Opportunity have settled that chestnut, and that’s quite apart from the visual evidence of what look like water channels, etc. on the Martian surface. Where’s there water, there’s the probability of life.

Lastly, it’s obvious that Earth and Mars would have exchanged materials via rocks being impacted off one planet and arriving on the other (so called ‘ballistic panspermia’). Since microbial life exists on Earth, some of it would have been transported throughout geological history to Mars. It’s quite possible that Mars seeded Earth as well, maybe even initially. Perhaps we are the Martians!  And of course, it’s probable that both Mars and Earth were seeded from another outside source. That, IMHO, settles that.

Further readings:

DiGregorio, Barry E. & Levin, Gilbert V. & Straat, Patricia Ann; Mars: The Living Planet; Frog, Ltd., Berkeley, California; 1997: 

Goldsmith, Donald; The Hunt for Life on Mars; Dutton, New York; 1997:

Sawyer, Kathy; The Rock from Mars: A Detective Story on Two Planets; Random House, New York; 2006: