True or False: A light-year is a measurement of time.

• False

• True

Scientists classify stars based on _____ and _____.

• temperature

• color

• size

• brightness

We live in an ______ galaxy.

• Spiral

• Irregular

• Quasars

• Elliptical

Our solar system formed ______ years ago.

• 4.6 billion

• 150 million

• 1 billion

• 4.8 billion

Tags

NGSS.HS-ESS1-6

True or False: Dark matter is the force that is causing the expansion of the universe to accelerate.

• False. Dark energy

• True. Dark matter

• False. Gravity

• False. Antimatter

Parallax is used to determine a star’s

• Distance from Earth

• Composition

• Temperature

• Brightness

Which of the following is a major difference between elliptical galaxies and spiral galaxies?

• Elliptical galaxies have almost no gas or dust between stars.

• Elliptical galaxies vary more in shape than spiral galaxies.

• Spiral galaxies have almost no gas or dust between the stars.

• Spiral galaxies contain only old stars.

A star is born when

• A nebula expands

• A protostar begins to cool

• Helium and oxygen combine

• Nuclear fusion starts

The theory astronomers have developed to describe the formation of the universe is known as what?

• Big crunch theory

• Collision-ring theory

• Galactic expansion theory

• Big bang theory

Tags

NGSS.HS-ESS1-2

Which of the following is not a characteristic of stars?

• size

• temperature

• texture

• chemical composition (what it’s made of).