Gravity makes the Earth round.
They both orbit the sun, but they're very different.
Should we go? Can we afford to go? All this, and more.
Don't you want to meet them?
Can we, uh, not give up on this planet quite yet?
The Voyager spacecraft are bringing “Johnny B. Goode” into deep space
For your favorite space enthusiast, go above, to infinity, and beyond.
The importance of today's landing
The anniversary of the Viking landing
Pluto is just the beginning
More than 200,000 aspiring space explorers volunteered for a one-way trip to Mars. Are they insane?
Rosetta is on a journey to unlock the history of the solar system.
Retired astronaut Scott Parazynski talks about his life of adventure
Even partial eclipses can be exciting.
Science takes off.
Home is where you hang your pressurized helmet
Lunar exploration started as an adventure, now prospectors also see dollar signs in that smiling cheese.
Is there a planet—or even planets—waiting to be discovered out there?
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Short answer: It depends who you ask
Scientists are hot on the trail of our solar system's 9th planet
Northwestern University puts on a Solar System symphony
This gas giant has seen it all.