Solar System and Beyond

Front

What are terrestrial planets?

Back

Terrestrial planets are rocky planets that have a solid surface, including Mercury, Venus, Earth, and Mars.

Front

What is the composition of galaxies?

Back

Galaxies are composed of stars, dust, and gas held together by gravity.

Front

What did people believe about the Earth in relation to the solar system?

Back

Many years ago, people believed that the Earth was the center of the solar system and that the stars and the Sun revolve around the Earth.

Front

What are the characteristics of the outer planets?

Back

The outer planets are very large, made of gases, and have no solid surface.

Front

What is gravity?

Back

Gravity is a force of attraction between any two objects.

Front

Name the four inner planets of the solar system.

Back

The four inner planets are Mercury, Venus, Earth, and Mars.

Front

What distinguishes gas giants from terrestrial planets?

Back

Gas giants are large planets made mostly of gases and do not have a solid surface, unlike terrestrial planets.

Front

What is the role of gravity in galaxies?

Back

Gravity holds stars, dust, and gas together in galaxies.

Front

How do the sizes of terrestrial planets compare to gas giants?

Back

Terrestrial planets are generally smaller than gas giants.

Front

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

Back

The Sun is the central star of the solar system and provides the necessary light and heat for life on Earth.