Earth has one _________________.
moon
An __________ is a rock that falls to Earth from space.
asteroid
A ________ is a big ball of ice and rock.
comet
A __________ is a space object, such as a comet, asteroid, or meteoroid.
meteorite
Our _______________ _______________ has 8 planets.
solar system
The ____________ has many galaxies in it.
universe
Astronauts travel in a ________________.
spacecraft
Use a _______ to look at stars and objects far away from you.
telescope
An ____________ is for studying for studying planets.
observatory
