Gas might keep the dwarf planet's subsurface ocean from freezing.
Even in space, bureaucracy exists.
Visiting the most distant object ever.
It's time to meet 2014 MU69.
MU69 is far from your run-of-the-mill solar system object.
It's the farthest object we've ever spotted in our neighborhood.
We're under a time crunch.
Short answer: Because we changed the definition of the word “planet” to better fit its meaning.
Meet the moon with 11 mile high cliff
A good week for space photography
Is there a planet—or even planets—waiting to be discovered out there?
But we won't know until we get there.
New Horizons will soon find out what's up with MU69.
It has to do with a surprisingly hazy atmosphere.
Two for the price of one.
There's still more to explore after Pluto.
Another day, another hypothetical object on the outskirts of the solar system.
A gallery of photos, visualizations, and other pictures of outer space.
More exciting news about cold, dead rocks
Scientists aren't just jerking you around—this is about something more than your childhood nostalgia
Based on NASA's best photos, anyway
The heavy heart may have tipped the world over
Imagine the space-scuba diving potential
Charon's polar cap once belonged to Pluto
Giant planet orbits three stars at once
The revolutionary explorer gets a life extension
Deep under the icy crust
Red, white, and black
Bubble, bubble, toil and trouble
Where can I find a planet like that?
This summer, the mission may get funding to travel to a mysterious rock at the edge of the solar system
Before Breakthrough Starshot goes interstellar, let's test the laser sails
Emails among scientists suggest it's possible
And it's still not Pluto
Massive chasms on the dwarf planet's largest moon explained
Like icebergs in the Arctic Ocean
How skeptical should we be, and how will we find out if this mystery planet is really out there?
Scientists are hot on the trail of our solar system's 9th planet
This is anything but hot
No such thing as too many Pluto pics
With 'Star Trek' and Pluto stamps, its time to start mailing things again
Lookin' pretty sharp, for a dwarf planet
Cathy Olkin talks about what New Horizons has seen and where it's going next
Could icy slush be driving the dwarf planet's geological activity?
Erupting slush instead of lava
How much are we really paying to explore the universe?
Bringing snark to Mars
Space sailors' delight?
Charon is the real #SuperBloodMoon in latest New Horizons pics
Latest New Horizons images show an alien landscape, and highest-resolution color map yet
The ocean-filled moon might hold the life we've long searched for in space. And scientists have one shot to reach it.
The dwarf planet may have a hydrological cycle, but it's not like ours
New images zero in on the former planet's diverse surface
Here's what New Horizons saw as it zoomed past the former planet
Choose wisely, because this is for real
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
Short answer: It depends who you ask
A total eclipse of the heart
They're teasing us with this awesome false-color picture
It just keeps getting better
The latest and greatest images from the New Horizons mission
Pics captured by New Horizons from just 48,000 miles away reveal the strange alien world
Pluto is just the beginning
The New Horizons flyby is over, but now the real fun begins
Watch it live, right here at 3pm, and prepare to be blown away
Stranger worlds to come
So. Many. Things.
New false color images reveal surprising geologic details
Can you feel the love?
NASA releases a breathtaking close-up right before New Horizons flyby
Popular Science goes way back
Fasten your seatbelts
New Horizons spacecraft reveals the dwarf planet is slightly larger, has polar ice cap, and more
After nine years and three billion miles, here's what we're learning from it all
Even though I helped demote it
Witness history in the making
New Horizons scientist Leslie Young discusses what to expect from the flyby on Tuesday, and the 28-year wait leading up to it
We just can't get enough
There's a chance you signed up back in 2005, alongside Elon Musk and Bill Nye
Just 3.5 million miles to go!
It's been 50 years since we got the first images of Mars. Now we're about to get the first images of Pluto.
The former planet is frosted in the stuff
The first color movies from New Horizons show Pluto and Charon in a weird waltz
(If you are like our editors and obsessed with all things space)
And he thinks the upcoming flyby will prove it
In July, New Horizons crosses the next great frontier in our solar system
Pulled by dual gravity, the egg-shaped satellites tumble like eerie dice
I spy with my little eye some variations in tone
Plus, is that a polar ice cap we see?
This year's missions to the outer solar system are set to shake up the planetary family tree
That's three moons down, two to go
A tour of places in our solar system where life could persevere
The little white dot is only going to get bigger
As you battle the blizzard, just be happy you don't live on Pluto
The Dawn spacecraft arrives at Ceres this March, and it could be the most surprising space mission in decades
What will we find when we reach Pluto and Ceres? We don't know, but it's going to be wild.
What's on the horizon for the New Horizons spacecraft