So. Many. Things.
And he thinks the upcoming flyby will prove it
Short answer: Because we changed the definition of the word “planet” to better fit its meaning.
Scientists aren't just jerking you around—this is about something more than your childhood nostalgia
Short answer: It depends who you ask
How skeptical should we be, and how will we find out if this mystery planet is really out there?
It could be something even cooler.
The early solar system was a wild, world-destroying place.
But this is far from the first time a country has destroyed a satellite with a missile and caused a ruckus.
It's just plane confusing.
Starving stars are more common than intelligent life
Keep an eye on Tethys
It turns out proximity is pretty inconsequential.
Countdown: 45 years left until 'First Contact'
What is going on with my moon?
Now astronomers want to know: what makes a star a star?
New research clears the reputation of these distant signals
In 1966, the Air Force sent an uncrewed space station into orbit
But it's not aliens.
Imagine taking a road trip to visit an old friend, driving for nine years, and finding out that, along the way, they had a couple more kids and turned into a potato
Experience over two minutes of glorious darkness.
How to interpret one popular Flat Earth theory.
The agency is targeting Mars Insight's launch date for May 2018
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
Space sailors' delight?
Witness history in the making
Deep under the icy crust
Bringing snark to Mars
But we won't know until we get there.
Even in space, bureaucracy exists.
Fifty times the size of Jupiter.
Even though I helped demote it
This year's missions to the outer solar system are set to shake up the planetary family tree
The dwarf planet may have a hydrological cycle, but it's not like ours
Scientists are hot on the trail of our solar system's 9th planet
The heavy heart may have tipped the world over
It has to do with a surprisingly hazy atmosphere.
Where can I find a planet like that?
Another day, another hypothetical object on the outskirts of the solar system.
Gas might keep the dwarf planet's subsurface ocean from freezing.
The first color movies from New Horizons show Pluto and Charon in a weird waltz
Cathy Olkin talks about what New Horizons has seen and where it's going next
The Dawn spacecraft arrives at Ceres this March, and it could be the most surprising space mission in decades
New Horizons spacecraft reveals the dwarf planet is slightly larger, has polar ice cap, and more
Pluto is just the beginning
Could icy slush be driving the dwarf planet's geological activity?
Imagine the space-scuba diving potential
Pulled by dual gravity, the egg-shaped satellites tumble like eerie dice
New false color images reveal surprising geologic details
There's a chance you signed up back in 2005, alongside Elon Musk and Bill Nye
And it's still not Pluto
Europa, the outer solar system, and a lot of questions.
In July, New Horizons crosses the next great frontier in our solar system
Something's got the Kuiper belt's rocks off, and there's a scramble to find it.
New evidence suggests it could be a rogue planet captured by our sun
The Event Horizon Telescope peered into the Messier 87 galaxy.
The spacecraft closes in on Ceres in March
An 'Oumuamua by any other name would still be as fascinating.
It just keeps exploding.
The baron of low-Earth orbit
Seeking a distant pale blue dot
But that's not too weird for the red planet.
Time for a new plan.
Don't call it 'Arrakis'
The answer is always lasers
Sorry, no aliens—yet.
Teaming up to explore the galaxy with an AI assist.
It defied the odds to discover thousands of planets.
An old theory gets a new assist from the sun.
One of 10 insane ideas that just might save the world
Kepler and Dawn guzzled through their precious gas for similar reasons.
Beta Pictoris is the ultimate family man ... er, star
A new study reveals bacteria can survive atmospheric entry
Look out, Elon Musk
Terrestrial life is a huge risk for other planets
But we'll have to get there first.
Instead of hosting planet-friendly dust, Proxima Centauri spews radiation.
This Mars-sized exoplanet is a big deal
Bring an umbrella
In the California desert, Honeybee Robotics is testing a drill that could search for life on other worlds
Or just watch pretty planets swirl by
Spelunking as a space simulation
The anatomy of a Dyson Sphere.
The company's open source AI software is an armchair explorer's dream.
The right kind of chemistry can lead to some strange sorts of worlds.
NASA is still trying to figure that out
Piping hot Jupiter fries, please!
They grow up so fast
Now in enhanced color!
There's another 1,327 on the waiting list
Now to figure out if it has liquid water. Or an atmosphere.
So hot right now.
TESS is blasting off on Wednesday night.
More than a light Venusian breeze.
And that's only the inner asteroid belt.
It could be the largest moon we've ever seen