Front

What is the Solar System?

Back

The Solar System is the Sun together with the planets orbiting the Sun, moons orbiting the planets, asteroids orbiting the Sun, comets orbiting the Sun, and other minor objects.

Front

How many planets are in the Solar System and what are they?

Back

There are eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

Front

What are the two categories of planets in the Solar System?

Back

The two categories are terrestrial planets (Mercury, Venus, Earth, Mars) and jovian planets (Jupiter, Saturn, Uranus, Neptune).

Front

What are the characteristics of terrestrial planets?

Back

Terrestrial planets are small, dense, composed primarily of metal and rock, with no moons or few moons, no rings, and slow rotation.

Front

What are the characteristics of jovian planets?

Back

Jovian planets are large, composed primarily of hydrogen gas and helium gas, with many moons, rings, and fast rotation.

Front

What is the ecliptic plane?

Back

The ecliptic plane is the plane of Earth's orbit around the Sun, and all eight planets orbit the Sun in nearly the ecliptic plane.

Front

What is the nebular theory?

Back

The nebular theory explains the formation of the Solar System from a diffuse nebula, leading to a flat, circular, rotating protoplanetary disk.

Front

What is the significance of the protoplanetary disk?

Back

The protoplanetary disk is the flat, circular, rotating disk from which the planets eventually formed.

Front

What are planetesimals?

Back

Planetesimals are baby planets that grew larger through accretion, eventually becoming planets.

Front

How did the inner and outer planets form differently?

Back

Inner planets formed from metal and rock due to the Sun's heat, while outer planets formed from hydrogen and helium, growing larger due to their distance from the Sun.