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1. Another name for our planet, earth, because that it is the third planet from our central star; known as the sun.

2. A TV show from the 90's that involved people that were aliens disguised as humans.
1. Tell the aliens that we are from the third rock from the sun.

2. Third Rock From The Sun is on UPN.
by Al "The Computer Guy" April 17, 2004
A television of the late nineties generally considered to be complete garbage.
"Third Rock from the Sun? That show was almost as bad as Frasier!"
by Da Illest Hustla July 05, 2006