Stars and Galaxies

Front

How many stars are in a galaxy?

Back

Millions or billions.

Front

What is the distance of Sirius from Earth?

Back

About 8.6 light years.

Front

What is a star?

Back

A massive ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

Front

Is the Sun the biggest star in the sky?

Back

False.

Front

What color of star is the hottest?

Back

Blue.

Front

What is a galaxy?

Back

A massive system that contains stars, star clusters, dust, gas, and dark matter, bound together by gravity.

Front

What is light year?

Back

The distance that light travels in one year, approximately 5.88 trillion miles.

Front

What is nuclear fusion?

Back

The process by which two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is a black hole?

Back

A region in space where the gravitational pull is so strong that nothing, not even light, can escape from it.

Front

What is the Milky Way?

Back

The galaxy that contains our Solar System.