Crash Course

"Nebula" is Latin for ___

• glow

• emmission

• gas

• cloud

What are nebulae?

• groups of exploding stars

• clouds of gas and dust in space

• a collection of stars

• groups of stars forming a pattern

Tags

NGSS.HS-ESS1-3

Stars, like our Sun, form from nebulae. How long ago did our Sun form?

• 4.6 million years ago

• 46 million years ago

• 4.6 billion years ago

• 46 billion years ago

A cloud of gas that has been excited by light from a nearby star is called ___

• a reflection nebula

• an emission nebula

• a lit nebula

• a glowing nebula

In an emission nebula, what is the predominant color of the glow from hydrogen?

• red

• yellow

• blue

• green

Tags

NGSS.HS-ESS1-3

In an emission nebula, what is the predominant color of the glow from oxygen?

• red

• yellow

• blue

• green

Tags

NGSS.HS-PS1-1

Compared to a typical nebula, how much more dense is the air we breathe?

• ten times more dense

• a thousand times denser

• a trillion times denser

• a thousand trillion times denser

Dust clouds that reflect the light of nearby bright massive stars are called ___

• mirror nebulae

• emission nebulae

• reflection nebulae

• excited nebulae

Tags

NGSS.HS-ESS1-3

Reflection nebulae are composed mainly of ___

• dust

• metallic gases

• hydrogen and helium

• ice crystals

Tags

NGSS.HS-ESS1-3

When astronomers talk about dust, they mean tiny grains with a width of about ___

• an angstrom

• a micrometer

• a millimeter

• a centimeter