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What is the closest star to Earth?
The Sun
What is a star made of?
Plasma
What color are the coolest stars?
Red
What color are the hottest stars?
Blue
How old is our Sun?
4.6 billion years old
What is the diameter of the Sun?
About 1.4 million kilometers
What is the term for a star’s true brightness, regardless of distance?
Absolute Magnitude
What is the term for how bright a star appears from Earth?
Apparent Magnitude
What type of star is the Sun?
Yellow dwarf star
What are two factors that affect the brightness of a star?
Size and temperature
What is the order of star colors from hottest to coolest
Blue, White, Yellow, Orange, Red
A red supergiant star with a diameter 830 times that of the Sun.
Betelgeuse
What is the name of the closest star to the Sun?
Proxima Centauri
Why does Rigel appear less bright than the Sun, even though it is actually brighter?
Because it is farther from Earth
How long does sunlight take to reach Earth?
8 minutes and 20 seconds
How many stars are in the Milky Way galaxy?
Approximately 400 billion
