PHOTO GALLERIES
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ASTRONOMY
Does a parallel universe exist? Here's what the leading theories say
The universe may be stranger than we think, and physics has a few wild explanations.
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ASTRONOMY
How a logger’s five-day disappearance became one of history's most famous alien abduction mysteries
A logger vanished in 1975 and returned five days later with a shocking alien abduction claim that stunned America.
5 animals who paved the way for human space travel
The story of human spaceflight began not with humans, but with animals. Read their stories here.
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SPACEFLIGHT
5 global music icons who claimed they saw UFOs
A look at five iconic and celebrated musicians who claimed to have had UFO encounters.
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ASTRONOMY
Wait, humans sent these into space? 5 strange objects you won't believe are still floating out there
Humans have launched some really strange things into space. Here are five of them.
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ASTRONOMY
Contact with 'advanced aliens' may not end well for Earth, warned Stephen Hawking
Why Stephen Hawking believed first contact with aliens could endanger humanity.
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ASTRONOMY
Did an advanced civilization exist on Earth long before humans?
It might sound like science fiction, but researchers actually studied the idea. Here's what they found.
5 PHOTOS
ASTRONOMY
5 PHOTOS
ASTRONOMY
4 major cosmic hazards that could pose threat to Earth
While Earth faces no imminent danger, it is, at the end of the day, at the mercy of the chaotic environment of space.
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DEEP SKY OBJECTS
5 weirdest planets found by NASA
Explore the 5 strangest planets discovered by NASA, from egg-shaped worlds to marshmallow-like giants defying cosmic rules.
How a late-night road trip turned into one of history's most chilling UFO mysteries
What began as a relaxing road trip soon turned into one of history's most unsettling UFO mysteries.
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ASTRONOMY
5 incredible facts you didn't know about the universe
The universe is even more incredible than you think.
5 PHOTOS
ASTRONOMY
"Where are they?": Brian Cox reveals why we still haven’t found aliens
The universe seems full of possibilities for alien life, so why is it still completely silent?
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ASTRONOMY
An asteroid could hit Earth with the energy of 22 atomic bombs—and NASA has a date for it
The asteroid is slightly wider than the height of the Empire State Building, and the effects of its impact could last three to four years.
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ASTRONOMY
5 famous people who claimed they saw UFOs
Have people really seen UFOs? Five celebrities who said 'yes'.
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ASTRONOMY
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ASTRONOMY
“Just show the alien”: Neil deGrasse Tyson urges greater transparency from government after UFO files release
Astrophysicist Neil deGrasse Tyson wants the U.S. government to release conclusive proof of alien life.
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SPACEFLIGHT
Why do many people still believe Moon landings were faked?
Why do some people still question the Moon landing? Discover the history behind doubts surrounding NASA’s historic lunar mission.
Space theories that may seem fictional but are strong possibilities
Did the Moon harbor life once? Will the universe tear itself apart one day? Discover space theories that seem straight out of sci-fi.
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ASTRONOMY
5 surprising facts about the Moon that most people don't know
Think you know the Moon? These 5 mind-bending facts might make you rethink everything
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ASTRONOMY
Why haven't aliens contacted us? Here's what a NASA-based scientist says
Turns out, the reason might not be as complicated as we think.
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ASTRONOMY
These 5 moons are the strangest in our solar system
Meet 5 of the strangest moons and learn what makes them so odd.
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ASTRONOMY