Understanding Stars and Telescopes

What causes stars to emit light and heat?

• They reflect sunlight.

• They are made of burning coal.

• They undergo atomic reactions.

• They are powered by electricity.

How many stars can typically be seen from Earth with the naked eye?

• About 20,000

• About 2,000

• About 200

• About 200,000

Why were stars important to sailors in the past?

• They were used for navigation.

• They provided light for night travel.

• They were used to communicate with other ships.

• They were a source of energy.

Who is credited with building the first telescope used to observe stars?

• Johannes Kepler

• Galileo Galilei

• Albert Einstein

• Isaac Newton

What is the primary function of a telescope?

• To capture sound from space

• To navigate ships

• To magnify distant objects

• To measure the temperature of stars