What is the closest star to Earth?

• the moon

• the solar system

• the sun

• Proxima Centauri

What unit of measurement do we use to measure the distance to stars?

• light-years

• kilometers

• galaxies

• miles

What is the name of the galaxy we live in?

• The solar system

• The universe

• The Milky Way

• The Hubble

How do scientists classify galaxies?

• by their shape

• by their color

• by their size

• by the sand on their beaches

What is the relationship between a quasar and a black hole?

• Before quasars vanish into a black hole, they give off energy in a burst of light and radio waves.

• Quasars make black holes.

• Quasars and black holes are both formed inside stars.

• Before stars vanish into a black hole, they give off energy in a burst of light and radio waves. The burst is called a quasar.

Where are stars born?

• Stars are born in nebulas.

• Stars are born in black holes.

• Stars are born when black holes collapse.

• Stars are born in red giants.

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Which part of the Milky Way Galaxy contains more stars?

• the edges

• its the same throughout the whole galaxy

• the center

• the lonely part

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How do scientists know black holes exist if they can't see them?

• It is impossible to see a black hole.

• Light escapes from them.

• They give off gravity.

• They can see vast amounts of matter being sucked into the hole.

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What do scientists think are probably at the center of most galaxies?

• super-large black holes

• super-large quasars

• super-large telescopes

• small black holes

What is the main idea of the first paragraph on page 191?

• There are many solar systems.

• There are different types of galaxies.

• Quasars emit light and radio waves.

• Irregulars are the rarest form of galaxy.

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