Universe Review

What is an astronomical unit?

• The distance from the earth to the sun.

• The distance light travels in one year.

• The distance from the earth to the moon.

The echo of the big bang, a band of light furthest out in our known universe, is called....

• The Echoplex

• The Cosmic Microwave Background Radiation

• The Doppler Effect

• The Cosmological Constant

If a star is 80 light years away, we can say.....

• The light we see coming from it left the star 80 years ago.

• The light we see coming from it left the star 80 Astronomical Units ago.

• The light from the star left only moments ago.

Typically, planets orbit their stars in _____________.

• circles.

• ovals.

• toroidals.

• loose orbits.

At aphelion, the earth is ___________ the sun.

• closest to

• furthest from

What is a nebula?

• A collection of gas and dust.

• A belt of asteroids.

• A perimeter of orbital objects of varying size.

What type of star can give birth to a planetary nebula?

• An average star that has grown into its red giant form.

• An average star that has grown into its red supergiant form.

• A massive star that has grown into its red giant form.

• A massive star that has grown into its red supergiant fomr.

Jovian planets are found in the outer solar system because...

• The accretion disk pushes gas and thin particles of dust further out than larger rock.

• The accretion disk pushes out larger rocks much faster than smaller dust particles.

What are rogue planets?

• Planets that orbit a star other than the sun.

• Planets that do not orbit a star.

• Any planet other than earth.

• Planets like Pluto.

What object becomes a meteor when it falls into the earth's atmosphere?

• Moons

• Asteroids

• Comets

• Star Fragments