Unit Test — Unit test Answers

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Which type of galaxy has arms that contain sites of active star formation and start close to a bulge in the center?

elliptical

irregular

barred spiral

normal spiral

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Which type of star system has the most stars?

open cluster

globular cluster

eclipsing binary

binary star system

Which event occurs during high tide?

All of Earth’s ocean levels rise.

The moon’s orbit is closer to Earth.

The gravity of the Sun and moon cause the Earth’s crust and water to bulge.

Earth’s crust and water are being pulled in opposite directions by the Sun and moon.

What will a medium-mass star become at the very end of its life cycle?

a red giant

a black hole

a black dwarf

a neutron star

How was Aristotle’s model similar to Ptolemy’s model?

Both models stated that the planets rotate on their axes.

Both models stated that Earth is the center of the system around which other objects orbit.

Both models stated that the planets and objects in the solar system have small orbits called epicycles.

Both models stated that the Sun is the center of the system around which objects have elliptical orbits.

How is the moon illuminated?

It produces its own light.

It reflects light from the Sun.

It transforms energy into light.

It absorbs light from the Earth.

Which phrase describes the composition of the outer planets?

are gaseous

contain water

have high densities

are made mostly of liquid

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