Tag Archives: Europa

Life in the Universe. Part 1: The Solar System


Life in the Universe

Part 1: The Solar System

evolution

It is a virtual certainty that we will discover extraterrestrial life within the next 20 years. There are many places in our solar system that would seem to make good cradles for life. Some of the best prospects include Mars, Europa, and Enceladus.

Mars has been tantalizing us for decades with its prospects for life. We have recovered a meteor blasted off of the surface of Mars that seems to contain fossilized life forms, although not all scientist agree with this premise. There have been experiments conducted by Mars landers that gave ambiguous results on the presence of life. But perhaps the most tantalizing sign comes from the seasonal methane cycles on Mars. Methane can be produced by either biological or geological processes. But there is no geological explanation of seasonal methane cycles. The prospects are good that these seasonal methane cycles are produced by organisms on Mars undergoing seasonal transformations. Methane, that gas from decaying garbage dumps and bovine flatulence is a necessary byproduct of organic life.

Europa has a vast ocean underneath a planetary ice cap. Ice fissures allow the subsurface ocean to leak through to the surface. When we look at the surface of Europa we see a fractured ice cap covered by reddish-brown crud along the fissures. It may be that this surface crud is some sort of life form resembling an algae bloom.

The extraterrestrial life be find in our solar system will be simple, single celled organism.

Life on Earth is a thousand times more diverse than I was taught in high school biology class. In school we were taught that there are plants and animals. The Sun was the source of all biological energy. Plants converted sunlight into sugars through photosynthesis. Herbivores ate the plants and carnivores ate the herbivores. All life was beholden to the Sun.

But now we know much more. There is life everywhere on Earth, and much of it totally cut off from the Sun. There are tube worms and shrimp in the deepest ocean trenches, using chemosynthesis to convert sulfur into energy in extreme high temperatures and pressures. There are organisms living in the boiling, caustic paint pots of Yellowstone Park. There are organism living deep underground, drawing their energy from the rocks. There are organism living in frozen glaciers. When glaciers calve, these life forms create a rich biomass in the ocean, a biomass that is the bottom of the food chain for all life in the polar oceans. There is even life forms living in the cooling ponds of nuclear reactors.

Along with plants and animals, there are fungi such as mushrooms, slime molds, algae, protozoa, and these are just our closest relatives. It has been suggested that there is more biomass below ground than there is above ground.

With life on Earth this diverse and abundant, we can expect that life will be prolific throughout vast sections of the Universe. Our own solar system is full of water and organic compounds, the two essential ingredients for life as we know it. Comets and asteroids have both in abundance. Spectroscopy of the Universe suggest that the same chemistry exists everywhere. Water and organic compounds exist throughout the Universe. On Titan there are lakes of liquid methane. On Europa there is more water than exists on Earth.

Proposal for a Mission to Jupiter and Europa


Now that Curiosity is safely on Mars and ready to begin its exploration, an exploration that could go on for decades due to its nuclear power plant, I would like to propose the next major NASA endeavor.

It is time to return to Jupiter.  The Galileo mission (1995-2003) was a tremendous success even though the spacecraft was crippled by the loss of its high gain antenna.  Some 90% of the potential data was lost due to the failure of this vital communication link.

It’s time to go back to Jupiter again.  Only this time the mission will look more like the Cassini-Huygens mission to Saturn.  The next Jupiter mission should include an orbiter to survey Jupiter and its moons.  But this time let’s add a lander for Europa.  Europa is the most promising venue for extraterrestrial life in the solar system. A rover on Europa could explore the ice floes and run tests on the surface materials.  The reddish-brown gunk that emerges from the cracks in the ice floes and spreads across the surface of Europa may be a life form similar to an algae bloom.  We need to go there to check it out.  Also, the rover could measure the thickness of the ice.  This step would be in preparation for a following mission that will melt its way through the ice to place a submarine into the ocean below.

Life in the Solar System


By gregbentall on May 28, 2012 | Edit

One of the most poignant questions that we face is, “Are we alone?”  Space is so infinitely vast, with hundreds of billions of galaxies, each one home to hundreds of billions of stars.  With such vastness of space it seems hard to believe that there is not someone else out there.  But our chances of linking up may be near zero.  Perhaps other civilizations have come and gone while we were still in the age of the dinosaurs, or even in the Bronze Age.  We may never know.  Just as once oceans and mountain ranges separated one tribe of humans from another, so may the vastness of space and time separate us from other intelligent life.

Flying Saucer Attacks Vancouver

But the question of life in beyond the earth is becomes a much different question if we are speaking of simple life forms.  There may be simple life forms to be found on other bodies in our solar system.  There is a chance that we will find some primitive organisms on Mars.

Mars is a near miss in terms of the development of life.  It is possible and perhaps even likely that life evolved on Mars.  But Mars as a life bearing planet had one fatal defect.  It was simply too small to sustain life for the extended period that it takes to develop an intelligent, technological society.

Mars simply was too small and cooled too quickly.  In the beginning it had a magnetic field generated by its core of molten iron.  Our robotic missions to Mars have found evidence of a likely place for life to evolve.  But as the small planet cooled, it lost its magnetic field and the force field that it created.  With the force field gone, the solar winds were able to strip Mars of its atmosphere and liquid water, and to bombard the surface with lethal doses of radiation.

But there are other sites in the solar system that are even more likely to harbor current life forms, places such as Jupiter’s Europa or Saturn’s Enceladus.  Both moons contain vast amounts of liquid water.  And we have found that where there is water there is life.

Europa shows signs of a liquid ocean below its frozen ice caps. Could this reddish brown stuff emerging from the cracks in the ice flows and spreading on the surface be a life form???

But there are other sites in the solar system that are even more likely to harbor current life forms, places such as Jupiter’s Europa or Saturn’s Enceladus.  Both moons contain vast amounts of liquid water.  And we have found that where there is water there is life.

Europa is covered with a frozen ice cap, much like the one found at earth’s North Pole.  We know that there is liquid water below the ice cap because the ice flows jostle around without any fixed reference points.  This shows that the ice is free floating above a liquid ocean below.

The ice on Europa floats about in broken flows, separated by dark red bands at the fracture points.  Here is a thought.  What if the reddish-brown crud that we see at the cracks in the ice flows and spreading on the surface of Europa are actually primitive life forms, something like an algae or bacteria?  If so, we might then be looking at extraterrestrial life forms with our earthbound telescopes.  We will never know until we get there and explore.

Cryobot prototype (Photo credit: Wikipedia)

The ideal mission to Europa would be to send a robotic space probe equipped with a submarine.  First we would check the surface. Then the submarine would melt its way through perhaps six miles of ice in order to submerse itself in the ocean below.  What it would find there is anyone’s guess.  But we might be pleasantly surprised.  We might find some primitive, single cell life forms, but we might also find some more advanced live forms, such as tube worms, shrimp, and perhaps even something similar to a squid.

And, if we can find a second example of life emerging in our solar system, than we can safely conclude that life is ubiquitous throughout the galaxy.

Such a mission to Europa would cost less than one one-thousandths of the cost of a manned mission to Mars, and just might lead us to a vastly more significant discovery.

Greg