Astronomy Mid Unit review

_____________ are made of gases, dust, and billions of stars and have different shapes.

• Universe

• galaxies

• solar systems

• planets

Meteors are chunks of rock that

• land on a moon or planets surface.

• is orbiting in space around the Sun.

• burns up as it enters Earth's atmosphere.

What does the Heliocentric system look like?

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What does the Geocentric system look like?

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What is the biggest difference between the Geocentric Model and the Heliocentric Model?

• the shape of the planets' orbits

• the movement of the moon

• the center of the solar system

The planets in our solar system orbit in an ellipse with the ______ at one of the two foci.

• Center

• Asteroid

• Sun

• Core

The place where a planet is closest to the Sun as it orbits the Sun is called the

• perihelion
• aphelion

The place where a planet is farthest away from the Sun in its orbit around the Sun is called the

• aphelion
• perihelion

When do planets move the fastest?

• Close to the sun
• Far away from the sun

The combined gravitational forces between the sun, moon, and earth result in different ______ _______.

• ocean waves

• tidal ranges

• sea level

• sun rays