Here on the little space rock, we call Earth, people regularly puzzle over whether we are separated from everyone else in this universe. However that question was not replied to in 2020, numerous revelations appeared to expand extraterrestrial elements’ possibilities. Discoveries on the nearest planet to us, in the external close planetary system and the long ways past, appeared to highlight the likelihood that different universes could have creatures going from microscopic organisms to mechanical creatures. Maybe, new outcomes in the coming year will, at last, uncover who else may be out there.
1. Alien bacteria might live in the clouds of Venus
Astrobiologists were atwitter with anticipation and scepticism in September when news broke of potential evidence of life in the upper clouds of Venus. The announcement pointed to the presence of phosphine, a rare and often poisonous gas that, on Earth at least, is almost always associated with living organisms. Venus has long played second fiddle to the seemingly more potentially habitable Mars with its hellish surface temperature, outlandish pressure, and sulfuric-acid clouds. But a team aimed both the James Clerk Maxwell Telescope in Hawaii and the Atacama Large Millimetre/submillimetre Array in Chile at Venus and picked up phosphine’s signature in a Venusian cloud layer with downright Earth-like temperatures and pressures. Terrestrial bacteria are known to thrive in some pretty tough conditions, making the biological explanation, not an unreasonable one. The research team doesn’t claim that it is airtight evidence of space bugs, and many in the community aren’t quite convinced, but if nothing else it will mean more funding in the hunt for life in unlikely places.
2. Navy declassifies UFO videos but doesn’t believe the hype
A fair number of Earthlings don’t care what ambiguous evidence scientists come up with to show that aliens are out there. They are convinced that we’ve been visited by technological beings many times, pointing to stories about UFOs and alien encounters (pretty much all of which have been debunked). True believers received a boost in April when the U.S. Navy released footage captured by pilots that showed odd wingless aircraft travelling at hypersonic speed, looking for all intents and purposes like bizarre alien machinery. Despite the existence of such videos, people should still be wary, argued freelance journalist Sarah Scoles in her book “They Are Already Here: UFO Culture and Why We See Saucers” (Pegasus Books, 2020). After deciding to look into the Navy evidence, Scoles was unable to determine if it really showed alien aircraft. But she found a much more human story by speaking to leaders in contemporary UFO culture and discussing our very basic need to believe in something beyond ourselves.
3. Milky Way could be teeming with ocean worlds
Ocean worlds, which are classified as those having significant amounts of water on or just beneath their surfaces, are surprisingly common in the solar system. Earth is obviously one such place, but Jupiter’s moon Europa is thought to host vast seas under its icy shell and Saturn’s moon Enceladus is known to have watery geysers spewing from its exterior. Momentum is in fact building in the astronomy community to send a probe that could land on either satellite sometime in the 2030s and check if any living things might lurk under their shells. As for ocean worlds beyond our sun, in a study released in June, researchers looked at 53 exoplanets similar in size to Earth and analyzed variables including their size, density, orbit, surface temperature, mass and distance from their star. The scientists conclude that, of the 53, roughly a quarter might have the right conditions to be considered ocean worlds, suggesting that such places could be relatively common in the galaxy.
4. Most aliens are probably dead
Where there’s life, there’s also death. While we like to imagine that our galaxy is teeming with technological beings capable of contacting us, the flip side is recognizing that all cultures rise and fall, meaning that plenty of cosmic societies likely bit the dust long ago. A model released in December put some numbers to these truths, taking into account such things as the prevalence of sun-like stars hosting Earth-like planets; the frequency of deadly, radiation-blasting supernovas; the time necessary for intelligent life to evolve if conditions are right; and the possible tendency of tool-bearing beings to destroy themselves. The analysis found that the highest probability of life emerging in the Milky Way likely happened around 5.5 billion years ago, before our planet even formed, suggesting that humanity is a relative latecomer to the galaxy and that plenty of our potential otherworldly partners are no longer around to talk to us.
5. Life could live around a black hole
When hunting life on other worlds, most scientists stick to what they know — searching for Earth-size worlds orbiting sun-like stars. But far more exotic configurations could exist such as a planet circling and heated by a black hole. At first glance, such a scenario seems absurd. But, contrary to popular depictions, black holes don’t just suck in everything around them. Gravitationally stable orbits are possible and the light from the cosmic background radiation — a relic with temperatures at near absolute zero from the early universe that permeates all of space — would get heated as it fell into the black hole. As a paper released in March showed, this could provide warmth and energy to any organisms that happened to evolve in such a strange location.
6. Earth bugs breathe hydrogen, maybe aliens do too
Most Earthlings require oxygen to survive. But oxygen isn’t common in the cosmos, making up about 0.1% of the ordinary mass of the universe. There’s far more hydrogen (92%) and helium (7%), and many planets, including gas giants like Jupiter and Saturn, are made mostly from these light elements. In May, scientists took E. coli (a bacteria found in the guts of many animals, including humans) and ordinary yeast (a fungus used to bake bread and make beer) and tried to see if they could live in different environments. Such microbes are already known to survive without oxygen and, when placed in a flask filled with either pure hydrogen or pure helium, they managed to grow, albeit at slower rates than usual. The findings suggest that when searching for organisms elsewhere in the universe, we might want to consider places that don’t look exactly like Earth.
Lastly, We should be open-minded as we search for life elsewhere
The human brain has plenty of constraints. We are misled by cognitive biases, optical illusions and inattentional blindness to things we don’t expect to see. One question that has always dogged research into alien creatures is whether or not we could recognize a life that is so different from what we encounter here on Earth. Scholars have long urged us to expect the unexpected, trying not to let theory too heavily influence what we count as significant. Life on other planets might not leave the same biological signatures as terrestrial organisms, making them difficult to spot from our vantage point. And, as Claire Webb, anthropology and history of science student at the Massachusetts Institute of Technology, told Live Science in January, we must train ourselves to “make the familiar strange,” looking at ourselves through an alien lens in an effort to constantly reexamine our own assumptions. That way, we might be able to better understand ourselves through the eyes of another and perhaps meet creatures on other worlds on their own terms rather than ours.