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- The Paradox That Started It All
- #Greatfilter
- Do Not Disturb The Aliens
- A "Gaian"-Tic Bottleneck
- Trapped in Deep Oceans
- Missed Signals
- We Are Being Impatient
To put it mildly, our solar system is very old. In fact, scientists are still figuring out just how old — clues gathered from meteorites suggest it is almost 5 billion years old, and surrounding star systems are likely billions of years older. While interstellar travel still seems to be a distant dream, new technology is born every year that allows...
Basic probability asserts that alien life must exist. Since we haven't made contact yet, one theory goes, there must be something barring life from interstellar travel or, at least, barring it from communicating with other alien species. This barrier is known as the "Great Filter," and it is a force or event that stops a civilization from getting t...
Another hypothesis asserts that alien civilizations certainly exist, but they're simply inactive. That's the "aestivation hypothesis" (aestivation refers to an organism's state of prolonged inactivity, similar to a bear hibernating or a frog that buries itself in sand during hot weather), which was put forth by researchers from Oxford’s Future of H...
According to the "Gaian Bottleneck" hypothesis, life needs particular environmental conditions to develop, and they're not so common. Astrobiologists at the Australian National University penned their explanationto the Fermi Paradox in 2016. Extinction is "the cosmic default for most life that has ever emerged on the surfaces of wet rocky planets i...
In 2015, after nearly a decade in transit, NASA's New Horizons spacecraft became the first to do a close flyby of Pluto. It offered humanity its first look at its icy surfaceand raised questions about the possibility of subsurface oceans of water, and lots of methane and nitrogen. These questions put Pluto on a short but growing list of worlds with...
For the past eighty years or so, we've been listening for signs of extraterrestrial life with radio technology. The Allen Telescope Array, situated 470 km (290 miles) northeast of San Francisco, is one of the biggest — since 2007, 42 dishes have stood at the ready to scan the skies regularly in the hope of receiving radio signals from extraterrestr...
We've only been actively reaching out for alien life for about a century — a mere blip in the long history of the solar system and of the universe overall. Evan Solomonides, an astrophysics and mathematics undergrad and researcherat Cornell University, suggests that it could take a while — about 1,500 yearsfrom now, to be precise — before we hear f...
Jul 6, 2023 · The idea that aliens exist is not a conspiracy theory. It becomes a conspiracy theory only when people believe that a small group — typically government insiders — are hiding information about aliens from the rest of us.
- Emilie Le Beau Lucchesi
Jan 18, 2021 · An eminent astrophysicist argues that signs of intelligent extraterrestrial life have appeared in our skies. What’s the evidence for his extraordinary claim? By Elizabeth Kolbert. January 18, 2021....
Jun 4, 2021 · Have alien spacecraft been buzzing across Earth's skies? Those are the questions being asked in the U.S. government's new report on unexplained aerial phenomena — its preferred term for what many...
- 2 min
- Bill Chappell
Oct 25, 2023 · Alien astronomers might be looking in our direction from distant planets. What would they see? We've been searching the heavens for some time now. But despite decades of listening for tell-tale...
Nov 25, 2023 · Aliens are having a moment. But the evidence says all possibilities remain in play, including the possibility that we are alone.
