The Universe

Which is listed in the correct order, smallest to largest?

• moon, star, planet, galaxy

• galaxy, star, panet, moon

• moon, planet, star, galaxy

• planet, moon, star, galaxy

Which best describes a nebula?

• A group of billions of stars, plus dust and gas

• A giant ball of burning gas

• A collection of dust and gas, where stars are born

• The massive, explosive death of a high mass star

What kind of galaxy is pictured?

• Spiral

• Elliptical

• Irregular

• Spherical

What is the correct term for an older star that is beginning to run out of fuel, and is expanding and cooling off?

• white dwarf

• red giant

• black dwarf

• prototstar

This star is small, not very bright, but very, very HOT.

• protostar

• main sequence star

• white dwarf

• planetary nebula

Which star is very hot and very bright?

• Rigal

• Sun

• Betelgeuse

• Procycon B

Which star is 4000 degrees and has a brightness of 10^-2 ?

• Rigel

• Sun

• Aldebaran

• Alpha Centauri B

Which statement is NOT true?

• Star 1 is brighter than the Sun.

• Star 2 is brighter than Star 1.

• Star 1 is hotter than Star 2.

• Star 2 is as hot as the Sun.

A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim, even through a telescope. Why do other stars look much dimmer than the sun?

• The sun appears yellow, which is more visible than other colors.

• The sun is much closer to Earth than other stars are.

• Other stars are made up of different gases than the sun is.

• As light from other stars travels through space, it gets reflected.

Based on the diagram, what spectral class does Barnard’s Star belong to?

• Spectral Class O

• Spectral Class B

• Spectral Class A

• Spectral Class M