Astronomy chapter 1

what is an 1 AU

• The average distance between the sun and earth

• the actual distance between earth and the sun

• the distance between earth and mars

• 3.0000 miles

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NGSS.MS-ESS1-3

The planet Mars is, on average, about 228 million km from the Sun. How long does it take light from the Sun to reach Mars? (Recall that the speed of light is about 300,000 km/s.)

• 365 days

• 1 day

• about 12.7 minutes

• 3 years

Our solar system is located about 27,000 light-years from the galactic center. About how far does our solar system travel in one orbit? (remember 2pir)

• 8000 light years

• 39,000 light years

• 54,000 light years

• 170,000 light years

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NGSS.HS-ESS1-4

Light travels at a speed of 300,000 km/s. About how far is a light-year?

• 80 trillion km

• 10 trillion km

• 4,000 km

• 1 trillion km

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NGSS.HS-PS4-3

Where is our solar system located within the Milky Way Galaxy?

• in the universe

• right at the end of the galaxy

• roughly halfway between the center and the edge of the visible disk of the galaxy

• great barrier of the way

Why do the patterns of the stars in our sky look the same from year to year?

• The stars are constantly moving closer to Earth.
• The stars are only visible during certain seasons.
• The stars change their brightness every year.
• because the stars are so far away

Astronomers infer that the universe is expanding because distant galaxies all appear to

• be moving closer to us closer ones moving faster

• be moving away from us, with more distant ones moving faster.

• disappearing

• sparking

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NGSS.HS-ESS1-2