Stars

It is the closest star on Earth.

• Sun

• Moon

• Proxima Centauri

Stars are mostly made up of

• hydrogen and helium

• hydrogen and oxygen

• helium and oxygen

Stars may range in color from a cool star, to a very hot star. Which color indicates coolest to hottest?

• yellow to red

• red to blue

• yellow to blue

Three or more stars that are bound by gravity are called

• shooting stars

• double stars

• multiple stars

Is the layer of the sun’s atmosphere that we see from Earth.

• ionosphere

• photosphere

• core

In the sun’s outer atmosphere, or corona, temperatures may reach how many °C?

• 1,000,000 °C

• 2,000,000 °C

• 3,000,000 °C

In the magnitude scale of the stars, the more negative it goes, brightest it becomes.

• true

• false

• maybe

Is a measure of the brightness of a star whose distance from Earth is known.

• absolute magnitude

• absolute value

• absolute distance

Sirius is much more luminous than the sun is.

• false

• true

• maybe

Which is the biggest among the following stars: Rigel, Sun and Antares

• Rigel

• Sun

• Antares