Space Unit Review

small, icy object that orbits the Sun and develops a tail as it nears the Sun

• comets

• asteroids

• meteoroids

• dwarf planets

spherical objects that revolve around the Sun in their own orbits

• comets

• asteroids

• planets

• dwarf planets

small pieces of rock, dust or debris that travel through the solar system 

• comets

• asteroids

• meteoroids

• dwarf planets

nearly spherical objects that orbit around the Sun with similar sized objects

• comets

• asteroids

• planets

• dwarf planets

meteoroids that enter the Earth’s atmosphere and create a streak of light as they burn up

• comets

• meteor

• star

• meteoroid

small, rocky objects that generally orbit the Sun between Jupiter and Mars

• comets

• asteroids

• planets

• dwarf planets

 a natural satellite that orbits an object other than a star

• comets

• asteroids

• moon

• dwarf planets

The Solar System was formed when __________ pulled a cloud of gas and dust together.

• electricity

• magnetism

• gravity

• momentum

Planets formed from _______ left over from the formation of the Sun at the center of the cloud.

• gravel

• gas, ice and dust

• solar winds

• asteroids

What is an astronomical unit?

• The distance from Earth to the Moon

• The distance from Earth to Jupiter

• The distance from the Sun to the Moon

• The distance from Earth to the Sun