True / False Test 9 - The Solar System

Passage

Our solar system consists of the Sun, eight planets, and many other objects such as moons, asteroids, and comets. The Sun is a star at the centre of the solar system, and it provides the light and heat that make life on Earth possible. The eight planets, in order from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The four inner planets - Mercury, Venus, Earth, and Mars - are called terrestrial planets because they have solid, rocky surfaces. The four outer planets - Jupiter, Saturn, Uranus, and Neptune - are called gas giants because they are mainly made of hydrogen and helium. Jupiter is the largest planet in our solar system; it is so big that over 1,300 Earths could fit inside it. Mars, often called the Red Planet because of its reddish appearance, is the planet that scientists are most interested in exploring. Several space missions have sent rovers to Mars to study its surface and look for signs of water. Scientists believe that Mars may have had liquid water billions of years ago.