The Solar System Review

The Sun is made up of mostly hydrogen and _____.

• oxygen
• carbon dioxide
• helium
• water vapor

The process in which the nuclei of atoms fuse together to form a larger nucleus is _______.

• nuclear fusion
• fission
• sunspot
• atom fusion

Why do planets orbit the Sun?

• The sun is at the center of the universe.
• The Sun is massive and its gravitational pull keeps the planets in orbit.
• The planets automatically orbit the sun because of the moons gravitational pull.
• Planets orbit the planetary path.

________ are fast-moving gases that can travel in space. 

• sunspots
• solar flares
• solar winds
• solar vents

______ are cooler areas on the Sun's surface that occur in 11-year cycles. 

• sunspots
• solar flares
• solar winds
• solar storms

_____ are powerful eruptions of particles on the Sun's surface. 

• solar winds
• solar flares
• suspots
• solar power

All stars form from enormous rotating clouds of dust and gases. This type of cloud is called a __________.

• nebula
• prostar
• red giant
• white dwarf

What is the last stage a star goes through?

• white dwarf
• red giant
• black dwarf
• prostar

A small rocky object that orbits the Sun is a(n)______.

• comet
• asteroid
• meteor
• planet

A ______ is a small orbiting body made of dust, ice, and frozen gases.

• asteroid
• comet
• meteor
• planet