"According to the new definition, a full-fledged planet is an object that orbits the sun and is large enough to have become round due to the force of its own gravity. In addition, a planet has to dominate the neighbourhood around its orbit.
Pluto was demoted because it does not dominate its neighborhood. Charon, its large "moon," is only about half the size of Pluto, while all the true planets are far larger than their moons.
In addition, bodies that dominate their neighborhoods, "sweep up" asteroids, comets, and other debris, clearing a path along their orbits. By contrast, Pluto's orbit is somewhat untidy."
Yes, you got it! :)
2 comments:
Yes.. last year when I thought my then tuition kid on solar system, I was still happily talking about Pluto when she said it's no longer part of the solar system... hmm... wasn't updated on that though...
-bedazled-
Hi ling, I laggi worse than you. Just knew it when making the flash cards. But i'm glad i've become a cleverer mummy. hehehee..
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