Are we the only intelligent life in the universe? Here's how we intend to find out.
Is time travel possible? Are the past and future set or can they be changed? Sci-fi books and films have long explored these ideas.
In the film "The Martian" (2015), an astronaut played by Matt Damon has to improvise when his crew leaves him behind by accident. Here's a look at what Watney would need to stay alive on Mars.
After decades of speculation, scientists now know for sure that liquid, salty water flows on the surface of Mars. See what the discovery means in our infographic.
A series of four total lunar eclipses in a row is called a tetrad, or four Blood Moons. See how lunar eclipse tetrads work in this Space.com infographic.
Daredevil sungrazing comets risk annihilation every time they skim the surface of our star. Here's how the Solar and Heliospheric Observatory tracks these comet interlopers.
Amazon founder Jeff Bezos leads Blue Origin, a commercial aerospace firm that hopes to send people on suborbital and orbital space trips.
How Solar Eclipses Work: When the moon covers up the sun, skywatchers delight in the opportunity to see a rare spectacle.
A planet only 20 million years old and still hot from its creation has been photographed in a solar system 96 light-years from Earth.
Scientists have released new information about comet 67p and what the Philae lander discovered there.
Astronomers have announced the discovery of planet Kepler-452b, orbiting a star very much like the sun but older and hotter.
Hardware developed for the race to the moon was used to foster collaboration between the two countries.
By studying data from the Kepler probe, scientists have found a planet about the size of Mars, about 200 light-years away from Earth.
A permanent cloud of dust has been found hovering around the moon, caused by the impacts of tiny particles from deep space.
Paving the way for Apollo's missions to the moon, the Gemini program provided much-needed experience for astronauts in space.
When Alexei Leonov stepped out of his Voskhod 2 capsule on March 18, 1965, he became the first spacewalker ever.
For years, tiny payloads have been launched into Earth orbit on satellites smaller than a loaf of bread.
At last humans are able to make educated guesses about what living on alien worlds might be like. Here's what we know about the alien planet Kepler-186f.
For more than 50 years, spacecraft have relied on rockets and tricky maneuvers to get out of danger when missions don't go as planned.
After an explosion crippled the spacecraft, the three astronauts had to fight to make their way back to Earth.
Halley's Comet, a dusty ball of ice and frozen gases, spends most of its time in the chilly outland of the solar system. See what it would be like to live on a comet in this infographic.