Lesson 1 Flashcard

Front

What is a nebula?

Back

A huge cloud of gas and dust where stars can form.

Front

What does the heliocentric model state?

Back

The Sun is at the center of the solar system.

Front

What does a light-year measure?

Back

The distance light travels in one year.

Front

What powers the Sun and makes it shine?

Back

Nuclear fusion.

Front

What is a galaxy?

Back

A large group of stars, gas, and dust held together by gravity.

Front

What is the main component of a nebula?

Back

Gas and dust.

Front

What is the difference between a solar system and a galaxy?

Back

A solar system consists of a star and its orbiting planets, while a galaxy is a large collection of stars, gas, and dust.

Front

What is nuclear fusion?

Back

A process where two light atomic nuclei combine to form a heavier nucleus, releasing energy.

Front

What is the significance of the Sun in our solar system?

Back

It is the central star that provides light and heat to the planets.

Front

How do we measure astronomical distances?

Back

Using light-years.