Solar system

The four inner planets include ______________.

• Mercury, Venus, Earth, Jupiter

• Jupiter, Saturn, Uranus, Neptune

• Mercury, Venus, Earth, Mars

• Mercury, Venus, Neptune, Pluto

The four outer planets include ______________.

• Jupiter, Saturn, Pluto, Neptune

• Jupiter, Saturn, Uranus Neptune

• Neptune, Earth, Pluto, Saturn

• Jupiter, Saturn, Uranus, Mars

A(n) _____ is an object that orbits the sun, has a spherical shape, and has a mass greater than other objects near it.

• planet

• comet

• asteroid

• star

The planets in the solar system are so far apart that scientists measure the distances between them in _________.

• kilometers

• astronomical unit

• feet

• light years

One of ____ moons is larger than the planet Mercury.

• Neptune

• Pluto

• Venus

• Saturn's

The outer planets are mainly composed of which of the following?

• hydrogen & oxygen

• hydrogen & helium

• methane & ammonia

• nitrogen & helium

Inner & outer planets are also referred to as _________ & _______ planets.

• terrestrial & gaseous

• big & small

• terrestrial & moons

• small & gas giants

All of the outer planets have which of the following?

• 7 rings

• evidence of life

• water

• moons & a ring system

How many planets are found in the solar system?

• 10

• 8

• 4

• 9

The sun is the only star in our solar system.

• True

• False