PHOTO GALLERIES
6 PHOTOS
ASTRONOMY
SETI chief: "I do believe aliens are real"—but they don't look like anything we imagine
We've long pictured aliens as little green men. SETI's chief says that's probably wrong.
7 PHOTOS
SPACEFLIGHT
The milestones that turned SpaceX into a private space giant
Here's how SpaceX went from repeated launch failures to a global private space powerhouse.
Could alien technology have already reached Earth? Harvard scientist Avi Loeb is searching for evidence
The Galileo Project by Harvard astronomer Avi Loeb is investigating whether aliens are carrying out reconnaissance activities on Earth.
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ASTRONOMY
Colonizing Mars “is the dumbest thing I've ever heard”, says Nobel Prize Winner Gary Ruvkun
Could moving to Mars save humanity, or are we solving the wrong problem? Here's what one Nobel winner says.
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ASTRONOMY
Are we alone? Scientists reveal why they think alien life could be real
After decades of searching, we still have no confirmed evidence of alien life. Here's what scientists say.
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ASTRONOMY
5 fascinating facts about the solar system's largest moon that sound too strange to be true
Think you know all about moons? These mind-blowing facts about Ganymede, the solar system's largest moon, may change your mind.
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ASTRONOMY
What's hiding out there?: Biggest space mysteries NASA still can't explain
Despite years of research, NASA scientists still can't fully explain these discoveries.
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ASTRONOMY
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ASTRONOMY
Could aliens be hiding among us? Harvard researchers explore a bold hidden civilization theory
Harvard scientists explore the possibility that advanced aliens could already be living on Earth
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ASTRONOMY
Could another version of you be out there? What scientists say about the multiverse
Endless versions of you could exist, each in a separate timeline. Here's what that means.
Will an asteroid hit the Moon in 2032? Here's what NASA says
NASA has provided a crucial update on a previously anticipated collision between Asteroid 2024 YR4 and the Moon in 2032.
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ASTRONOMY
Are aliens simply off the grid? A theory offers a surprising solution to the Fermi paradox
A scientific theory from 2009 offers a surprising explanation for why humanity has found no signs of alien life in the universe.
5 PHOTOS
ASTRONOMY
International Moon Day: A look at NASA's most iconic Moon images
Take a closer look at the Moon through some of the most memorable images ever captured.
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ASTRONOMY
7 incredible Moon treasures brought back to Earth by Apollo astronauts
From Moon rocks to lunar soil, explore seven Apollo treasures that reshaped our understanding of the Moon.
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ASTRONOMY
Six Moon myths and the facts behind these popular beliefs
Some lunar beliefs have stood for centuries, but are any of them true? Here's what science says.
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ASTRONOMY
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ASTRONOMY
Why haven't we found aliens yet? 5 strange possibilities that might explain the Fermi paradox
Despite the unimaginable size of the universe, we haven't found any aliens yet. Here are theories that try and explain why.
5 PHOTOS
ASTRONOMY
This is how humanity will die: Stephen Hawking's predictions for the end of the world
Hawking spent decades warning about how humanity might end. Here's what he predicted.
From Kendall Jenner to Shaquille O'Neal, six famous people who claimed they saw UFOs
Here's a look at some celebrities who have claimed to have had run-ins with Unidentified Flying Objects (UFOs).
6 PHOTOS
ASTRONOMY
These 5 asteroids are passing closer to Earth than you might expect
Space is full of drifting rocks. Here are a few that are passing unusually close to Earth.
6 PHOTOS
ASTRONOMY
5 facts about the International Space Station you probably didn't know
The International Space Station (ISS) is one of humanity's greatest scientific and engineering feats. Here are five fascinating facts about it.
5 PHOTOS
SPACEFLIGHT
The chilling theory that explains why we haven't found aliens yet
For decades, we've looked and found nothing. This could be why.
5 PHOTOS
ASTRONOMY