Space Exploration Unit Test

What do astronomers study?

• Space objects and the universe.

• Weather patterns on Earth.
• The history of human civilization.
• Animal behavior in the wild.

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How are astronomers different from other scientists?

• They are typically smarter.

• They do not work in a laboratory.

• They do not get to touch or see up close the things they study.

• They do not study living things.

Scientists can use light to study objects in our universe because light:

• is easier to sense than sound.

• can travel through empty space.

• moves faster than radio waves.

• is not visible in space.

The term electromagnetic spectrum refers to:

• The range of all electromagnetic radiation wavelengths.
• The speed of light in a vacuum.
• The color spectrum visible to the human eye.
• A type of sound wave.

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How fast does light travel through outer space?

• 300,000,000 meters per second

• 300,000 kilometers per hour
• 1,000 kilometers per second
• 150,000 kilometers per second

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About how many minutes does it take light from the Sun to reach Earth?

• 5 minutes and 30 seconds
• 10 minutes
• 15 minutes
• 8 minutes

What is a light-year?

• A light-year is a unit of distance used in astronomy to measure objects that are very far apart.

• A light-year is a type of star found in the universe.
• A light-year is a measure of time used in astronomy.
• A light-year is the speed at which light travels.

Proxima Centuri is 4.22 light-years away from us. This means that when we are looking at the this star we are seeing it as it existed:

• 4.22 years ago
• 4.22 minutes ago

• 300.000,000 x 4.22 years ago

• 1 year ago

Light is a form of (choose 2 correct answers):

• Electromagnetic radiation
• Chemical energy
• Thermal energy
• Energy

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Electromagnetic waves have 2 parts: an electric field and:

• a magnetic field
• a thermal field
• a sound wave
• a gravitational field

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