(Correction: An earlier version of this story misstated how far Pluto is from the sun. The correct number is 3.7 billion miles.) What was discovered in Flagstaff, Arizona, and killed off in Prague?

During a brief appearance on "The Late Show with Stephen Colbert" in 2017, Tyson said the Earth's moon has five times the mass of Pluto, and yet it's a "moon," not a planet. As per Tyson ...

The controversy endures over Pluto's true status, but the solar system underdog continues to capture hearts across the globe. Clyde Tombaugh didn't set out to discover Pluto when he sent his ...

Our Moon is surprisingly massive compared to Earth, but that ratio is dwarfed if we consider Pluto and Charon. The latter is about 12 percent of the mass of Pluto and technically doesn’t orbit it.

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Pluto is in the Kuiper belt, a ring of bodies beyond the orbit of Neptune. It is made primarily of ice and rock and has only one sixth the mass of Earth's moon, and one third its volume.

If a person with a mass of 55kg was to travel to Jupiter or Pluto, the effects of gravity would be very different from those on Earth. Gravity is the pull that a planet exerts towards its centre.

With the exception of Pluto, planets in our solar system are ... These planets are relatively small in size and in mass. A terrestrial planet has a solid rocky surface, with metals deep in its ...