If we find extraterrestrial life, we have enriched the story of the universe, not diminished ourselves.” The Great Filter theory suggests that all life must overcome certain challenges, and at ...

Unfortunately, we can’t study extraterrestrial life to answer this question. But we can study some 4.5 billion years of Earth’s history, looking at where evolution repeats itself, or doesn’t.

Maybe we’re the only intelligent life in the universe after all. By Mike Wehner. ... One of the biggest — or perhaps the biggest — is whether or not we’re alone in the universe.

If habitable worlds are rare, then we might be the only intelligent life in the galaxy, or even the visible universe. And yet, we're here. That must count for something, right?

The ancient Greek philosopher Anaxagoras (500-428 BC) was the first person to hypothesize that the seeds of life are present ...

How we might look for life in the universe — even if we can’t recognize it Extraterrestrial life may look nothing like life on Earth. So, astrobiologists are coming up with a framework to ...

More and more astronomers are coming around to the idea that we’re not alone in the universe. To them, it’s a matter of math, and humility. With potentially trillions of life-supporting ...

As we understand it today, life on our world began, at the latest, only a few hundred million years after Earth was formed. That puts life as we know it already nearly 10 billion years after the ...

The author’s book. Andrea Frazetta. We discovered them on asteroids and the dwarf planets Ceres and Pluto, and these are only a few examples. Much farther away still, nearly 200 hundred types of ...

Our evolution may have been like winning the lottery…only far less likely. The universe is astonishingly vast. The Milky Way has more than 100 billion stars, and there are over a trillion galaxies in ...