PHOTO GALLERIES
6 PHOTOS
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.
5 PHOTOS
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.
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
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.
5 PHOTOS
ASTRONOMY
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.
6 PHOTOS
DEEP SKY OBJECTS
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.
6 PHOTOS
ASTRONOMY
5 incredible facts you didn't know about the universe
The universe is even more incredible than you think.
5 PHOTOS
ASTRONOMY
6 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?
5 PHOTOS
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.
5 famous people who claimed they saw UFOs
Have people really seen UFOs? Five celebrities who said 'yes'.
6 PHOTOS
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.
4 PHOTOS
ASTRONOMY
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.
5 PHOTOS
SPACEFLIGHT
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.
4 PHOTOS
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
5 PHOTOS
ASTRONOMY
6 PHOTOS
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.
6 PHOTOS
ASTRONOMY
These 5 moons are the strangest in our solar system
Meet 5 of the strangest moons and learn what makes them so odd.
5 of the most mysterious UFO sightings ever reported
Decades later, these five UFO cases are still open.
6 PHOTOS
ASTRONOMY
5 space facts that sound fake, but they're 100% real
From a planet that could float on water to storms that rage for years, space is home to unreal wonders.
6 PHOTOS
ASTRONOMY
Strangest objects spotted in our own Solar System
The Solar System has served up quite a few surprises for scientists. Here are some of the strangest objects spotted in our own cosmic backyard.
6 PHOTOS
ASTRONOMY
Scientists believe these 5 alien worlds could harbor life beyond Earth
Here's how close 5 alien planets have come to answering the question: 'Does life exist beyond Earth?'
6 PHOTOS
DEEP SKY OBJECTS