Okay, it's really just an eclipse.
Short answer: Because we changed the definition of the word “planet” to better fit its meaning.
What the heck is a Space Force? We finally (sort of) know.
Can gardens help astronauts go farther?
Museums are looking to the past for inspiration.
Notes from a field trip to New Mexico's commercial spaceport
3D printing our way to the year 2050
Plus, 9 simple ways to move in zero gravity
Science takes off.
The next one isn't until 2033, so enjoy the pictures now
We are very very small
In 1962, Korabl-Sputnik 1 landed smack in the middle of a main street in Wisconsin
A new book showcases images from the forgotten Gemini mission, which taught NASA how to live and work in space
The story of heroic fasteners that will get us to the moon and back.
What we learned at a space conference that puts inclusivity first
Reflections from a prodigious force in space exploration.
The identification system blinks for a millionth of a second.
The evidence is right in front of you.
Ky Michaelson is basically Max Valier reincarnated
"Take your second right past Mars on the magic..."
Their dream jobs just became a reality.
It's not all glamour and spacewalks, but it is rewarding.
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Now it's up to President Obama to decide whether Earth businesses can own pieces of asteroids
Northwestern University puts on a Solar System symphony
One of 10 insane ideas that just might save the world
Excerpt: Chasing Space
And it could help prove the existence of Planet Nine.
People all over the world celebrate important holidays by turning up the lights
Massive chasms on the dwarf planet's largest moon explained
Warping space to fight infinities
And that's only the inner asteroid belt.
Every little bit counts.
The latest and greatest images from the New Horizons mission
Fasten your seatbelts
It's amazing what centuries of data can do.
Salt, smoke, and dust.
A linguist looks into the missing 'a.'
It's not a black hole or a worm hole, however
My god, it's full of street lamps
A "dramatic outburst event"
What to expect as the Rosetta mission follows Comet 67P to its closest encounter with the Sun
Three of them may be habitable
Drone swarms, a flying luxury car, and a rocket to the moon.
Itokawa is surprisingly wet.
An interview with Keri Bean, NASA engineer and R2D2's best friend
This isn't good news for a future Mars trip
In 1952, the Hayden Planetarium offered applicants the trip of a lifetime
It's been 50 years since we got the first images of Mars. Now we're about to get the first images of Pluto.
Makes your junk drawer look manageable in comparison
A Saturn IB perched atop a launch pedestal is an odd but iconic image of the end of the Apollo era. Here's why it existed.
A look at the spacecraft's first year studying the Martian atmosphere
Everybody poops. In space, it's pretty difficult and requires a lot of planning.