What is Earth's closest star?

• Sun

• Proxima Centauri

• Sirius

• Betelgeuse

What type of star is the Sun?

• high mass star

• average mass star

• low mass star

• black hole

The Sun will eventually turn into a supernova and form a black hole.

• true

• false

The distance from the Earth to the Sun is 93 million miles which is

• 1 light year (ly)

• 1 astronomical unit (1AU)

• 2 astronomical units (2AU)

• 1 light years (2ly)

When astronomers measure distances outside our solar system, they use the measurement

• astronomical units

• light years

• light speed

• astronomical meters

Galaxies are categorized by their shape. What shape is the Milky Way galaxy?

• elliptical

• spiral

• irregular

• oval

Most galaxies rotate around a central core which would be

• a massive star

• a nebula

• a supermassive black hole

• an exoplanet

The star, Proxima Centauri, is 4 light years away from Earth. How long does it take for its light to reach us?

• 4 years

• 40 years

• 400 years

• 4,000 years

All stars begin in a cloud of gas and dust known as a

• disk

• accretion

• nebula

• Oort Cloud

All stars will eventually run out of material and nuclear fusion will stop.

• true

• false