Unit 3 - The Universe and its Stars

Front

What characteristics are used to classify stars?

Back

Size, brightness, and temperature.

Front

What does the Hertzsprung-Russell diagram show about main-sequence stars?

Back

They increase in brightness as they increase in temperature.

Front

When is a star born?

Back

nuclear fusion starts

Front

What is a supernova?

Back

The explosion of a dying high-mass star.

Front

What color are the coolest stars?

Back

red

Front

The absolute brightness of a star depends on its:

Back

size and temperature

Front

The Milky Way galaxy is an example of a(n)

Back

spiral galaxy

Front

What is defined as the distance between wave crests?

Back

Wavelength

Front

Which wavelengths of the electromagnetic spectrum are used to gain information about the components of the universe?

Back

Radio, infrared, visible light, ultraviolet, and X-rays

Front

What is a light-year?

Back

The distance light travels in one year