Understanding Galaxies Quiz

What is a galaxy primarily composed of?

• Dark matter, dark energy, and black holes

• Water, rocks, and ice

• Planets, asteroids, and comets

• Stars, gas, and dust

Approximately how many stars does the Milky Way contain?

• 100 million stars

• 1 billion stars

• 500 billion stars

• 300 billion stars

What type of galaxy is the Milky Way?

• Irregular galaxy

• Spiral galaxy

• Elliptical galaxy

• Lenticular galaxy

What holds galaxies together?

• Gravity

• Dark energy

• Magnetic fields

• Electromagnetic radiation

What percentage of galaxies are spiral?

• 40 percent

• 60 percent

• 20 percent

• 10 percent

What is at the center of most galaxies?

• A supernova

• A black hole

• A neutron star

• A white dwarf

What type of galaxies contains mostly old stars and little gas?

• Elliptical galaxies

• Ring galaxies

• Irregular galaxies

• Spiral galaxies

Which galaxy is closest to the Milky Way?

• Andromeda

• Triangulum

• Whirlpool

• Sombrero

What characteristic feature do spiral galaxies have?

• A ring-like structure

• No particular shape

• Stretched out circles

• Spiral arms

How long do you think it takes our solar system to travel around the center of our galaxy?

• About 230 million years

• About 100 million years

• About 500 million years

• About 1 billion years