The Discovery That Demoted Pluto

This is Eris, the

If you were in elementary school before 2006, there's a good chance you had to memorize the order of the 9 planets in our solar ...

They called

It was the American astronomer Clyde Tombaugh

For most of our lives, we've considered

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Pluto

Beyond Neptune lies the vast and mysterious Kuiper Belt region, home to ancient icy relics that contain clues about how our solar ...

Why is

Pluto

Once thought to be a lifeless grey rock on the edge of our solar system,

The story of how

A compilation of @astrumspace videos exploring the New Horizons mission to

Pluto

This BBC Documentary, '

Pluto

For more than seventy years, we believed our Solar System was complete — a familiar family of planets orbiting the Sun. Then a ...

Pluto

In 2006, the International Astronomical Union (IAU) had to come up with a definition for a planet. Orbit the Sun, have enough mass ...