Chapter 16: Space

The solar system is made up of:

• Planets, moons, and the Sun

• Only planets

• Stars and galaxies

• Comets and asteroids only

The theory that suggests the universe started off as an extremely small, hot, and dense object that exploded is known as:

• Steady State Theory

• Big Bang Theory

• String Theory

• Quantum Theory

The force that keeps an object moving in a circular orbit is called:

• Centripetal force

• Gravitational force

• Frictional force

• Magnetic force

The term for the process when hydrogen nuclei fuse together to form helium nuclei is:

• Nuclear Fission

• Nuclear Fusion

• Radioactive Decay

• Ionization

The term for a huge cloud of dust and gas pulled together by gravitational attraction is:

• Nebula

• Galaxy

• Black Hole

• Supernova

The name of the galaxy that contains billions of other stars is:

• Andromeda Galaxy

• Milky Way Galaxy

• Triangulum Galaxy

• Whirlpool Galaxy

The Solar System is in which galaxy?

• Andromeda Galaxy

• Milky Way Galaxy

• Triangulum Galaxy

• Whirlpool Galaxy

All stars start off as what?

• Planets

• Asteroids

• Nebulae

• Comets

The expansion of a star is caused by what kind of reaction?

• Nuclear fusion

• Chemical reaction

• Gravitational collapse

• Magnetic interaction

A main sequence star remains stable due to the balance between which two forces?

• Gravitational force and electromagnetic force

• Nuclear fusion and gravitational force

• Electromagnetic force and nuclear fusion

• Nuclear fusion and radiation pressure