Pluto
9 questions tagged Pluto — spanning every one of the seven Ws.
When did New Horizons fly past Pluto?
NASA's New Horizons spacecraft flew past Pluto on 14 July 2015, giving humanity its first close-up images of the dwarf planet.
Which is the largest dwarf planet?
Pluto is the largest known dwarf planet by diameter (about 2,377 km), though Eris is slightly more massive.
Why is Pluto covered with nitrogen, methane, and carbon monoxide ice?
Pluto is extremely cold, so volatile gases freeze onto its surface as ices. Its thin atmosphere can also freeze out and return as the dwarf planet moves farther from the Sun.
Why does Pluto’s atmosphere escape into space?
Pluto’s low gravity and weak atmosphere let gases leak away more easily, especially when sunlight warms the surface. Some molecules gain enough energy to drift off into space over time.
Whose spacecraft first reached Pluto and showed that it has a heart-shaped plain?
That was NASA's New Horizons mission in 2015. It made the first close flyby of Pluto and revealed the famous Sputnik Planitia region.
When did the first spacecraft successfully visit Pluto?
NASA’s New Horizons became the first spacecraft to fly by Pluto on 14 July 2015.
Where is Pluto’s Tombaugh Regio located?
Tombaugh Regio is on Pluto’s heart-shaped region near the dwarf planet’s equator. It was named after Pluto’s discoverer, Clyde Tombaugh.
Where is the largest crater on Pluto located?
Pluto’s largest known crater is found on the dwarf planet’s surface within the Kuiper Belt. One of the biggest named impact basins is Burney Crater.
Whose calculations first explained why Pluto’s orbit is so tilted and eccentric?
Pluto’s unusual orbit is understood through modern celestial mechanics developed by many scientists, not a single person. Its tilt and eccentricity are linked to Neptune’s gravitational influence and orbital resonance.