Formation of Planetary Systems

Front

What indicates that all planets in the solar system formed at about the same time?

Back

All planets orbit in the same direction as the Sun rotates.

Front

Why do terrestrial planets have high densities?

Back

They are made of rock and lighter elements were stripped away by the Sun.

Front

What is the primary reason Jovian planets have low densities?

Back

They formed farther from the Sun and kept lighter elements.

Front

What characterizes Jovian or gas giant planets?

Back

They have many moons, thick atmospheres, and rapid spin rates.

Front

What do astronomers use to understand the origin of the solar system?

Back

Models based on current observations.

Front

Define terrestrial planets.

Back

Rocky planets with solid surfaces, such as Earth and Mars.

Front

Define Jovian planets.

Back

Gas giants with thick atmospheres, such as Jupiter and Saturn.

Front

What is retrograde motion?

Back

The apparent backward motion of a planet as observed from Earth.

Front

What role do heavier elements play in the formation of terrestrial planets?

Back

Heavier elements contribute to the high density and solid surfaces of terrestrial planets.

Front

How do the distances from the Sun affect planet formation?

Back

Planets closer to the Sun are rocky, while those farther away are gas giants.