Formation of the Solar System

Front

What are space objects built of solid particles that can form planets through collisions and mergers?

Back

Planetesimals

Front

What is formed when the dense concentration of gas and dust at the center of a rotating disk reaches a temperature and pressure high enough to fuse hydrogen?

Back

Helium

Front

From what do astronomers think the solar system formed?

Back

Interstellar clouds

Front

What is the name for the early model of the solar system where all objects were thought to orbit Earth?

Back

Geocentric model

Front

What is the term for the apparent backward movement of a planet?

Back

Retrograde motion

Front

What is the primary component of the Sun that undergoes fusion?

Back

Hydrogen

Front

What is the process called when a star forms from a dense region in a molecular cloud?

Back

Stellar formation

Front

What is the term for the model of the solar system that places the Sun at the center?

Back

Heliocentric model

Front

What are the small rocky bodies that orbit the Sun, primarily found between Mars and Jupiter?

Back

Asteroids

Front

What is the name of the force that keeps planets in orbit around the Sun?

Back

Gravity