What distinguishes a tornado watch from a tornado warning?

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.

Most short-period comets do not have randomly oriented orbits because