Astronomy Unit Review

The natural satellite of the Earth is the 

• Sun

• comet

• asteroid

• moon

Approximately 90 percent of the stars in the H-R diagram are ____ stars.

• red giant

• main sequence

• luminosity

• supergiants

The asteroid belt is located between the orbits of Mars and Jupiter.

• True

• False

The Sun has a main sequence lifespan of about 10 billion years.

• True

• False

The distance between the Earth and the Sun is a ______________

• astronomical unit.

• light year

• kilometer

• meter

When a star moves away from the Earth, its light appears more blue.

• True

• False

What is the shape of a planet's orbit?

• parabolic

• circular

• elliptical

• irregular

A Hertzsprung-Russell (H-R) diagram shows the relationship between ____.

• apparent magnitude and parallax

• parallax and temperature

• absolute magnitude and apparent magnitude

• temperature and absolute magnitude

Answer explanation

Absolute magnitude = Luminosity

Which of the following is NOT a terrestrial planet?

• Earth

• Mercury

• Saturn

• Mars

The spin of an object on its axis is called ______

• orbit

• rotation

• revolution

• tide