For decades, robotic missions have been exploring Mars to learn more about the planet’s geological and environmental history. Next year, the Perseverance rover will join in the hunt and be the first mission to send samples back to Earth and by the 2030s, the first crewed mission is expected to take place. All of these efforts are part of an ongoing effort to find evidence of past (and maybe even present) life on Mars.
According to a new study from Rutgers University-New Brunswick., the most likely place to find this evidence is located several kilometers beneath the surface. It is here (they argue) that water still exists in liquid form, which is likely the result of geothermal heating melting thick subsurface sheets of ice. This research could help resolve lingering questions like the faint young Sun paradox.
Continue reading “You’re Going to Need a Bigger Drill. The Best Place for Life on Mars is Deep, Deep Underground”
Author’s note: This article was written in collaboration with Vincent Kofman, a co-author of the paper it discusses and Post Doctoral Researcher at NASA’s Goddard Space Flight Center
Amino acids are one of the most important building blocks of life as we know it. At its core, they contain an amino and an acid group, through which they can link together with other amino acids. That linking process can form long chains, which is how they form proteins. In humans, 20 different amino acids make up all proteins, and the difference between them is in the molecular side chain between the amino and the acid group. The different groups make interconnections in the chain, folding it into highly specific forms, allowing the proteins to perform highly specific tasks, ranging from metabolism, to muscle movement, and cell duplication.
Given that their presence is a necessary, though not necessarily a sufficient, condition for the development of life, scientists have spent many decades exploring where they first formed. With a paper in Nature Astronomy published last month, they moved one step closer to that understanding, by discovering that it is possible to form glycine, the simplest amino acid, in the star nurseries of interstellar clouds.
Continue reading “Glycine Can Form In Interstellar Clouds”
Observations have already confirmed the existence of a sub-surface ocean on Europa, and there has been rampant speculation about whether they could contain life. While there have been tentative plans to send a submersible spacecraft to this ocean, we are still a long way from uncovering what lies in those depths.
Which is one big reason why the geysers that occasionally shoot out of Europa’s ice sheet have garnered such interest. Scientists hoped that some of the ejected water could come from that ocean. It could then be sampled with a simple fly-by mission, such as Europa Clipper, rather than a submersible craft. However, a new paper published in Geophysical Research Letters suggests a much more mundane source of the geysers – local liquid water buried in the moon’s thick ice shelf.
Continue reading “Geysers on Europa might come from pockets of water under the ice”
So, Venus might have life! But how do we find out for sure?! We need to GO there.
Continue reading “A Balloon Mission that Could Try to Confirm Life On Venus”
When it comes to places with the potential for habitability, Venus isn’t usually considered on that list. The hot, greenhouse-effect-gone-mad neighboring planet with a crushing surface pressure and sulfuric acid clouds certainly isn’t friendly to life as we know it, and the few spacecraft humanity has sent to Venus’ surface have only endured a few minutes.
But up about 40 to 60 km (25 to 37 miles) above the surface, the atmosphere of Venus is the most Earth-like of any other place in the Solar System. There, Venus has air pressure of approximately 1 bar and temperatures in the 0°C to 50°C range. It’s not quite a shirtsleeves environment, as humans would need air to breathe and protection from the sulfuric acid in the atmosphere. Plus, also consider that Venus is considered to be in the habitable zone of our star.
Continue reading “Could There Be Life in the Cloudtops of Venus?”
Remember back in 2008 when the Phoenix lander on Mars scraped away a few inches of rust-colored regolith to reveal water ice? Or in 2009, when Mars Reconnaissance Orbiter observations revealed vast areas of subsurface ice, event at low latitudes?
These findings – and many more like them – indicate there’s a lot of interesting things going on underneath Mars’ lifeless surface. Since we know from experience on Earth that anywhere there is water, there is life, the question of life on – or under – Mars’s surface is always provocative.
Continue reading “Thanks to Cosmic Radiation, There Could be Life on Mars, Just a Couple of Meters Under the Surface”
Over the years, scientific estimates of potential intelligent life in our galaxy have ranged widely. Some estimates say just one (only us Earthlings) to just a handful, to possibly thousands or even millions. A new study attempts to quantify the number of other worlds we could potentially talk to by estimating the number of intelligent civilizations within the Milky Way that are actively communicating.
Continue reading “New Estimate Calculates There Could be 30 Intelligent Civilizations Communicating Across the Milky Way”
In our search for exoplanets, we have found more than three dozen potentially habitable worlds. It’s estimated that there are 8 to 20 billion potentially habitable, Earth-like worlds in our galaxy alone. But there is a big difference between potentially habitable and actually habitable, and scientists are starting to narrow their definitions.
Continue reading “Is the Concept of a Habitable Zone Too Wide?”
What do coal, crude oil, and truffles have in common? Go ahead. We’ll wait.
The answer is thiophenes, a molecule that behaves a lot like benzene. Crude oil, coal, and truffles all contain thiophenes. So do a few other substances. MSL Curiosity found thiophenes on Mars, and though that doesn’t conclusively prove that Mars once hosted life, its discovery is an important milestone for the rover. Especially since truffles are alive, and oil and coal used to be, sort of.
Continue reading “Curiosity Finds Organic Molecules That Could Have Been Produced by Life on Mars”
The title of Earth’s Earliest Life has been returned to the fossils in the Pilbara region of Australia. The Pilbara fossils had held that title since the 1980s, until researchers studying ancient rocks in Greenland found evidence of ancient life there. But subsequent research questioned the biological nature of the Greenland evidence, which put the whole issue into question again.
Now a new study of the Pilbara fossils has identified the presence of preserved organic matter in those fossils, and handed the ‘Ancient Life’ crown back to them.
Continue reading “Confirmed. Fossils That Formed 3.5 billion Years Ago, Really are Fossils. The Oldest Evidence of Life Found So Far”