Many stars are classified in terms of brightness, or

A ___ star has a greater temperature than a ___ star.

Our sun is

Which process is occurring at the center of all active stars?

Which of these stars is the OLDEST?

The process that fuels a star is BEST described as

Star light, star bright: how bright a star appears to us on Earth depends MAINLY on

Luminosity is the amount of energy emitted by a star each second. Stars radiate light over a broad range of frequencies in the electromagnetic spectrum, from the low energy radio waves to high energy gamma rays. The luminosity of a star depends on tw

Scientists classify stars by colors: white, red, blue. The color of a star helps to tells us how ________ the star is.

Many of the stars we see in the night sky are called blue giants. They put out more energy and burn millions of times brighter than the Sun. Why does the Sun appear much larger and brighter from Earth than blue giant stars?

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