The famous framework ranks civilizations by energy use — but ignores a critical factor that can halt their progress.

Mars was warmer and wetter long ago. If anything was alive there, what came next was either a tragedy or a masterclass in survival.

As the world teeters on the brink of nuclear war, distant, advanced civilizations would never know it. Earth appears peaceful from far away.

Andy Weir’s novel blends humor, scientific rigor, and human ingenuity to make science fiction feel believable and thrilling.

In theory, the fabric of space could have been curved in any way imaginable. So why is the Universe flat when we measure it?

Brian Cox examines why, despite billions of stars and trillions of planets, we have found no evidence of other intelligent life.

No civilization, no matter how successful, can last forever. What does the non-detection of intelligent aliens mean for our own longevity?

Thanks to modern tech, Earth is now considered a ‘detectable’ planet. Astrophysicist Sara Seager explains how this idea can lead us to discovering life elsewhere in our universe.

A big open question in 21st-century science is how life began here on Earth. The metabolism-first scenario just might be the best one.

Speculative evolution explores the strange paths natural selection might have taken — and what that means for humans.

Some sci-fi aliens are wildly implausible. Others aren’t so far-fetched.

One big goal of science is to find an inhabited, Earth-like planet. But if we find an Earth-like world, will we even recognize it?

Military satellite research brought us GPS. Astronomers influenced medical imaging tech. What would be invented after we discover alien life? Professor Sara Seager explains the consequences of such a groundbreaking discovery.

The unanswered questions about sex, love, and pregnancy in space could shape the future of humanity more than we think.

No claim has even made it halfway up the Confidence of Life Detection (CoLD) scale, but 21st century science is just beginning to unfold.

Astronomer Jill Tarter explains why SETI is really about technology, patience, and learning how to tell alien signals from our own.

30 years ago, we didn’t know other stars had planets orbiting them. Now, we may be on the verge of finding Earth’s Twin. Sara Seager explains.

Astronomer Lisa Kaltenegger spoke with Big Think about how "the colors of life" could leave detectable traces on distant planets.

There will always be "wolf-criers" whose claims wither under scrutiny. But aliens are certainly out there, if science dares to find them.

Particles are everywhere, including particles from space that stream through the human body. Here's how they prove Einstein's relativity.

Finding alien Earths requires seeing Earth-sized planets at Earth-like distances from Sun-like stars. A new discovery completes the roadmap.

NASA’s Caleb Scharf talks with Big Think about life’s long experiment in expansion.

What if the first search for life beyond Earth actually succeeded?

Do aliens speak the same physics that we do, with similar laws, observables, and underlying mathematics. Maybe not, argues Daniel Whiteson.

“Deep down the natural endpoint of this whole goal of looking for planets is to answer the question: are we alone?”

In 2025, Earth remains the only planet where life is known to exist. Without a second example, "The Stand" has a vital lesson to teach us.

Big Think spoke with astronomer David Kipping about technosignatures, "extragalactic SETI," and being a popular science communicator in the YouTube age.

Organic compounds can form through simple chemistry alone — making the search for true biosignatures trickier than it seems.

The red planet, Mars, may once have been teeming with life, just as Earth is today. Finding "organics" on Mars, however, doesn't mean life.

The most common type of exoplanet is neither Earth-sized nor Neptune-sized, but in between. Could these haze-rich worlds house alien life?