A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.

• stellar nebula

• galaxy

• pulsar

• accretion disk

Region with globular clusters, Very old, low metallicity stars, Very slow rotation around galactic center.

• halo
• thin disk

• spiral arms

• central bar

Very old stars have low heavy metal content because they are composed of "original" gas and dust before element synthesis by previous supernovae.

• True

• False

Tags

NGSS.HS-ESS1-3

Which region contains Relatively younger stars ( < 10 billion years old), Gas and Dust where stars are still forming.

• central bar

• spiral arms

• halo

About 95% of the mass of the Milky Way galaxy is actually from ____.

• gas and dust

• planets

• dark matter

• stars

Objects farther from the center have a ______ orbital period than do those closer to the center.

• faster

• slower

• same

Tags

NGSS.HS-ESS1-4

What is TRUE about "dark matter"? Choose ALL that apply!!!

• Does not emit electromagnetic radiation

• It is not directly observable

• Scientists know what its made of

• It has no mass

What is found at the center of the Milky Way galaxy?

• A supermassive black hole

• dark matter

• a collection of young yellow dwarfs

• globular clusters

An old, dying supergiant near a supermassive black hole _____.

• is repelled and moves away from the black hole.

• increases in temperature and mass.

• gives up matter that falls into the black hole.

• becomes more massive.

What is the name of our galaxy?

• Andromeda

• Milky Way

• Crab

• Sagittarius A*