Some see this as evidence that the universe is teeming with life on numberless planets. But what if we find fossil bacteria on Mars with genetics eerily similar to the ones we have on Earth? That could end up undermining such claims. But we shall see.
Siegel: It’s the ultimate nightmare of astrobiologists: that there’s a fascinating history of life to uncover on another world, but we’ll contaminate it with our own organisms before we ever learn the true history of life on that world.
Speculations about space aliens isn’t. It may take a while to find out if there was ever life on Mars but maybe we’ll really know something this time.
Sheldon: The point is that we don’t expect to find nitrate and ammonia in the soil of Mars, not unless some nitrogen fixing bacteria put it there recently, because over time it will all come out of the soil as N2 gas. Claiming that the process goes the other way, from N2 in atmosphere to nitrates in soils, goes backwards, from high entropy to low entropy.
Standish: If the nitrogen cycle isn’t established within a certain time, nitrogen will be removed from the atmosphere and the surface will become rich in nitrate (bad) or, in a reducing atmosphere, ammonia (really bad). The bottom line is that there are speculations that probably get around this, but it is one more needle that has to be threaded for chemical evolution to produce the first life, or a problem for the first life to quickly take care of.
Researcher: Findings suggest that structure alone is not sufficient to confirm whether or not microscopic life-like formations are fossils. More research will be needed to say exactly how they were formed…
Maybe this is the closest we’ll ever really get to extraterrestrial life. Go there and grow stuff.
Life on Mars would be a lot of fun but one suspects it’ll never live up to the hype.
Levin: When the Viking Molecular Analysis Experiment failed to detect organic matter, the essence of life, however, NASA concluded that the LR had found a substance mimicking life, but not life. Inexplicably, over the 43 years since Viking, none of NASA’s subsequent Mars landers has carried a life detection instrument to follow up on these exciting results.
Gotta be true. Is this to certain secularist communities in science what an imminent Rapture is to certain evangelical Christian ones?
Natalie Coleman at Futurism: A paper published last month … argues that the “primary colonists” of the Red Planet should be “microorganisms” — the bacteria, viruses, and fungi that support many of life’s processes here on Earth.
If there apparently isn’t and never has been life on Mars, why should we assume it exists elsewhere? If there is/has been life on Mars and it looks like it came from Earth, well, that’s a game-changer in itself. If it doesn’t look like it came from Earth, that opens up whole new, *non-speculative* vistas.
She also reveals that a two-page survey was handed out, asking a number of none-o’-yer-business questions on behalf of “Audience Research & Analysis, an organization that helps government agencies and cultural agencies to “move forward with decision research.”
Riffing off Elon Musk’s goal of sending humans to Mars by 2024, and NASA’s plans to send astronauts there after they visit the Moon again, Rice University evolutionary biologist Scott Solomon envisions “mutations cascading through the gene pool”: After about two generations, he thinks their bones will strengthen, they’ll need glasses for nearsightedness, their immune Read More…
We are told that Earth and Mars are like two siblings who have grown apart: “There was a time when their resemblance was uncanny: Both were warm, wet and shrouded in thick atmospheres. But 3 or 4 billion years ago, these two worlds took different paths”: Long ago, Mars stopped changing, while Earth continued to Read More…