Unit 1 + 2 Review

What is the Sun composed of? (click all that apply)

• Hydrogen

• Helium

• Oxygen

• Carbon dioxide

True or false: Sirius has a luminosity smaller than the Sun?

• True

• False

What is the Sun's surface temperature in Kelvin?

• 10,340 K

• 10,000 K

• 5,000 K

• 5,500 K

What is the range between the hottest and coldest temperatures of a star on the HR diagram?

• 2,000K-40,000 Kelvin

• 2,000 -6,000 Kelvin

• 20,000 -10,000 Kelvin

• 4,040-8,900 Kelvin

Which star has the highest luminosity?

• Sun

• Rigel

• Betelgeuse

• Spica

What is the last stage of a star's life?

• White dwarf

• Supergiants

• Red giants

• Main sequence

The Earth's Sun formed directly from a

• Nebula

• Supernova

• Red giant

• White dwarf

What reference lines are meeting at the poles?

• North pole

• Prime Meridian

• Equator

• South Pole

If the Sun is at 6000 K, what is Procyon B at?

• 7,000

• 5,000

• 8,000

• 20,000

Which reference lines are drawn horizontally (E-W) across the Earth & measure how N or S you are?

• Latitude

• Longtiude