Do you know …
1. Why are planets spheres?
They are big enough so that the gravitational force
pulls every part of the planet to the center,
causing it to be shaped like sphere.
2. Why is Pluto a dwarf planet?
•
Is smaller than Mercury but large enough to have
enough gravity to be a sphere.
• Orbits in a zone that has many other objects in it.
P. Reardon 2008 – Based on “Science Starters” by T. Trimpe at http://sciencespot.net/