The moon is the Earth's _____________, an object that revolved around another object.
Each time the Earth spins on its axis, it makes one ____________.
A "shooting star" is a _____________, which is a piece of rock that burns up in the earth's air.
Saturn is made of gass and Pluto is made of _____________.
The Pioneer went to Venus and the Pathfinder went to ____________.
The Hubble is a ______________.
The Voyager was a ____________>
The Big Dipper is part of a ________________.