Unit 1 Review

A(n) ________________ is a large group of stars, gas and dust bound together by gravity.

• nebula

• galaxy

• redshift

• solar system

The solar system formed from a(n) ________________, which is a rotating cloud of gas and dust that formed into the sun planets.

• solar nebula

• Hubble telescope

• planets

• Big Bang Theory

An increase in the wavelength of light as a galaxy moves away from Earth is called a(n) _________________________.

• white light

• blueshift

• black hole

• redshift

Earth, Venus, Mars, and Mercury are considered _________________ planets.

• gas giants

• far from the sun

• terrestrial

• made of gas

A(n) _____________________ is a small, rocky object that orbits the sun; many are located in a band between Mars and Jupiter.

• comet

• asteroid

• star

• planet

Ptolemy thought the Earth was the center of the solar system. This is called

• heliocentric

• geocentric

• Earthy

• gravity

The Kuiper Belt is best described as

• minor planet-sized objects that orbit the sun in a flat belt beyond Neptune's orbit

• often larger than some planets in the solar system

• 100 AU wide

• extremely hot

The gas giants are

• Jupiter, Saturn, Uranus, and Neptune

• Earth, Mars, and Venus

• Pluto, Saturn, and Jupiter

• Earth, Jupiter, Neptune and Saturn

Which is NOT true about Saturn?

• it travels around the Sun once every 29.5 years

• it is the only planet with a ring system

• it is made of mostly hydrogen and helium

• it has a lot of moons

Earth, Mercury, and Venus are terrestrial planets. What does that mean?

• made of rock and ice

• made of gas

• made of rock and orbit the Sun

• made of hydrogen