In which sequence are the items listed from least total mass to greatest total mass?

• A) solar system, Milky Way, universe

• B) Milky Way, solar system, universe

• C) universe, Milky Way, solar system

• D) Milky Way, universe, solar system

The explosion associated with the theory and the formation of the universe inferred to have occurred how many billion ago?

• A) less than 1

• B) 2.5

• C) 4.6

• D) over 10

What is the name usually given to the group of objects consisting of a sun and any planets, comets, and other objects that orbit it?

• A) a solar system

• B) a universe

• C) a galaxy

• D) an ecosystem

The theory that the universe is expanding is supported by the

• A) blue shift of light from distant galaxies

• B) red shift of light from distant galaxies

• C) nuclear fusion occurring in the Sun

• D) radioactive decay occurring in the Sun

The star Algol is estimated to have approximately the same luminosity as the star Aldebaran approximately the same temperature as the Rigel. Algol is best classified as a

• A) main sequence star

• B) red giant star

• C) white dwarf star

• D) red dwarf star

Which star has a higher luminosity and a lower temperature than the Sun?

• A) Rigel

• B) Barnard’s Star

• C) Alpha Centauri

• D) Aldebaran

Which planet would float if it could be placed in water?

• A) Mercury

• B) Earth

• C) Saturn

• D) Pluto

The planets known as "gas giants" include Jupiter, Uranus, Neptune and

• A) Mars

• B) Pluto

• C) Earth

• D) Saturn

Compared to Jovian planets, terrestrial planets have

• A) larger masses

• B) larger equatorial diameters

• C) shorter periods of revolution

• D) shorter periods of rotation

Most igneous rocks form by which processes?

• A) erosion and deposition

• B) heat and pressure

• C) melting and solidification

• D) compaction and cementation