Astronomy Unit Review

1. Read the question
2. Write your answer on the white board
3. Write ONLY the answer

Question #5:

What theory says that wavelengths change as objects come toward or away from you?

Answer:

The Doppler Effect

Question #6:

What is the theory that says the universe started as one mass and then exploded?

Answer:

The Big Bang Theory

• How do we KNOW that the universe is still expanding?

• We see the red shift

Question #14:

Which telescope made it a lot easier to study stars from Earth?

Answer:

The Hubble telescope

What is the shape of Earth?

oblate spheroid

What is the difference between rotation and revolution?

rotation is spinning on its axis

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revolution is Earth’s path around the sun

What is the difference between precession and nutation?

Precession is the “wobble” in Earth’s rotation

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Nutation is the vibrations within the precession

What is the difference between heliocentric and geocentric?

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Which is the CORRECT view of our solar system?

Heliocentric = Sun at the center of the universe

Geocentric = Earth at the center of the universe

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Heliocentric is correct

Question #19:

What is the process that stars use to generate energy?

Answer:

Nuclear fusion

Question #20:

Which element do hydrogen atoms turn into during fusion?

Answer:

Helium

Question #26:

What is a large group of stars called?

Answer:

A galaxy

Question #27:

What is the name of our galaxy?

Answer:

The Milky Way

Earth’s year is determined by …

• Earth’s revolution around the Sun
• (a little more than 365 days)

• What determines the length of one day?

• The time it takes Earth to rotate once on its axis

• What causes the seasons on Earth?

• The TILT of Earth

Question #29:

What are the two main elements in the sun?

Answer:

Hydrogen and Helium

(remember – the sun is just a star)

Question #30:

What is the outermost layer of the sun?

Answer:

Corona

Question #31:

What is the layer of the sun that we see?

Answer:

Photosphere

Question #31:

What are the cool places on the sun?

Answer:

Sunspots

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Question #32:

What are arches of glowing gas that arch above the sun?

Answer:

Solar prominences

Question #33:

What are the most violent solar prominences called?

Answer:

Solar flares

Question #34:

What are the auroras called?

Answer:

Northern lights or Southern lights

Question #45:

What do we call a body that orbits another body?

Answer:

A satellite

• How old is our moon?

4.6 Billion years old

(about the same age as Earth – they were formed at the same time)

• How does the moon affect tides?

TWO WAYS:

• The side of Earth facing the moon experiences high tide.
• When the moon is in alignment with the Earth & sun (full moon & new moon), we experience Spring Tides (higher high tides)

Question #48:

What is it called when one planetary body passes through the shadow of another?

Answer:

An eclipse

Question #49:

What is it called when the moon is between the Earth and the sun and blocks the sun’s light?

Answer:

Solar Eclipse

Question #50:

What is it called when the Earth is in the middle of the moon and the sun and blocks the moon?

Answer:

Lunar eclipse

Question #51:

What is it called when the part of the moon reflecting light is getting bigger?

Answer:

Waxing

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Question #52:

What is it called when the part of the moon reflecting the light is getting smaller?

Answer:

Waning

Question #53:

What is the phase of the moon that is completely dark?

Answer:

New moon

Question #54:

What is the phase of the moon that is showing all of it illuminated?

Answer:

Full moon

What affects the tides on Earth?

Gravitational pull of moon

This concludes today’s review activity.

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Have fun studying!!