Universe Exam Review

How many main spiral arms does the Milky Way galaxy have?

• 1

• 2

• 4

• 6

Which of these are the main spiral arms of the Milky Way?

• Orion & Perseus

• Scutum-Centaurus & Sagittarius

• Perseus & Scutum-Centaurus

• Norma & Local

In the Milky Way galaxy, what spiral arm is our solar system located in?

• Sagittarius

• Local

• Norma

• Perseus

Why does the Zone of Avoidance appear empty?

• interstellar dust

• it is actually empty

• it is too far away

• a black hole blocks all light

Based on a galaxy's luminosity & size, astronomers can estimate the amount of what?

• energy in the galaxy

• stars in the galaxy

• gravity of the galaxy

• matter in the galaxy

What does not interact with normal matter or light?

• baryonic matter

• interstellar matter

• dark matter

• black holes

What type of dark matter moves at or near the speed of light?

• normal matter

• cold dark matter

• blue dark matter

• hot dark matter

Dark energy makes up the majority of _______________.

• the solar system

• astronomers' experiments

• the Universe

• stars

What is one possible theory for dark energy?

• the Big Rip

• the Big Bang

• quintessence

• expansion

Einstein's cosmological constant tries to explain ______________.

• the creation of our Universe

• how the Sun was made

• solar nebulas

• dark energy