Space Science Unit Test

Gas and dust exist in space and are the remnants from the formation of the universe or exploding stars, these are known as stellar nurseries. What do we call these?

• nebula

• neutron stars

• ablation

• plasma

What do you call the process of combining atoms. This happens in the core of stars.

• fusion
• fission

• light

• heat

What do you call the process of splitting atoms. This happens in nuclear reactors.

• fission
• fusion

• heat

• light

What it the name of our galaxy, the one where our solar system is located.

• Milky Way
• Andromeda

• Betelgeuse

• Magellanic Cloud

Place these objects in order from smallest to largest.

• Planets, solar system, universe, galaxy
• Solar system, planets, galaxy, universe
• Planets, solar system, galaxy, universe
• Galaxy, solar system, planets, universe

The classification of Galaxy is based on its observable characteristics. Which of these characteristics is used to classify galaxies?

• shape

• temperature

• types of forces

• chemical elements

What do you call a huge collection of dust, gases, billions of stars and their solar systems held together by the force of gravity?

• comets

• asteroids

• galaxies
• stars

What do you call an astronomical unit of measure equal to the distance light travels in a year, approximately 5.8 trillion miles or 9 trillion Km.

• light year

• astronomical unit

• wattage unit

• luminosity unit

What is needed for fusion to occur

• High density and low pressure

• High temperatures and low pressure

• High pressure and high temperature

• High pressure and low density

What protects life on Earth from gamma rays, X rays, and particles emitted by the Sun?

• The ozone layer in the stratosphere
• The ionosphere
• The magnetosphere (Earth's magnetic field)
• Clouds