Were There Always Nine Planets?

So far, we know of nine planets in our solar system. Some astronomers think that there may be a tenth planet beyond the orbit of Pluto, the farthest known planet from the sun. And others think there was once a tenth planet that doesn’t exist anymore!

The space between Mars, the fourth planet from the sun, and Jupiter, the fifth planet, is filled with thousands of asteroids, small rocky bodies that revolve around the sun. The biggest asteroid is about 600 miles across, but most are less than a mile in diameter.

Some astronomers believe that these asteroids may be all that’s left of a planet that exploded millions or billions of years ago. But these asteroids may also be just pieces of space dust that never formed into a planet.

The orbit of one asteroid occasionally brings it “only” 485,000 miles away from earth!

About Karen Hill

Karen Hill is a freelance writer, editor, and columnist. Born in New York, her work has appeared in the Examiner, Yahoo News, Buzzfeed, among others.

2 thoughts on “Were There Always Nine Planets?”

  1. There’s now only 8 confirmed planets. Pluto is ruled out as a planet due to size and location. Also there are planetary bodies exactly like pluto in that same area.

  2. Pluto may have been demoted, but for the love of the god of death, its still a planet. Its in our solar system- NASA is just hating.

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