|
The Milky Way is one of over a trillion ____ in the Universe.
|
comets
|
|
An asterism is any pattern of ____ seen in the Earth's sky.
|
galaxies
|
|
When asteroids smash together, ____ (small rocks) break off.
|
meteorites
|
|
Galileo discovered Jupiter's four largest ____ in 1610.
|
meteoroids
|
|
Stars arise in freezing clouds of dust and gas known as ____.
|
meteors
|
|
Meteors that reach the Earth's surface are called ____.
|
moons
|
|
Meteoroids that enter the Earth's atmosphere are called ____.
|
nebulae
|
|
Most ____ originate in the Kuiper belt or the Oort cloud.
|
stars
|
