As Buzz Aldrin descended the lander’s ladder, Neil Armstrong captured the moment.
As NASA opens up the International Space Station to private astronauts, the romance of space will be within reach for those who can afford it.
Intelligent planet-hoppers could populate a galaxy in as little as 650,000 years.
In the Martian landscape that is the Atacama desert, astrobiologists are learning how to recognize extraterrestrial organisms.
Earth's slipping, sliding outer crust could be key to hosting a wide variety of living things.
The nation’s dogged attempts to chase eclipses follow its own haphazard maturation.
Readers plan to take in the eclipse using psychedelic drugs, boat trips, and other diversions.
Traveling into the moon’s shadow with loved ones
The “Great American Eclipse” is a showcase for great (and sometimes not great) American branding efforts.
Previous presidents and political leaders have joined in the rare cosmic spectacle, but the president has no eclipse plans so far.
The cosmic event may be fleeting, but your friends’ reactions will be worth capturing.
Under the moon’s shadow, humans have created both grand myths and scientific breakthroughs.
After decades of what seemed to be settled science, there’s new, conflicting evidence for how the moon might have formed.
Get your eclipse glasses and sunscreen ready.
This month’s solar eclipse is likely to put major pressures on infrastructure.
We want to know how you’re celebrating the celestial event of the summer.
Advances in how satellites image the planet’s artificial lights are helping scientists estimate global patterns of energy use.
An elegy for Earth Observing-1
Ellen Stofan was the only woman to testify at a congressional hearing about the future of space exploration—and the only person left out of the official tweets about the event.
The gas travels alongside particles from the sun, and could offer clues to life’s origins.