1.
asteroid: 
a small chunk of rock that orbits around the sun
2.
How big is the sun compared to the earth?: It is 109 times larger than the earth.
3.
How do the objects in the solar system move?: They travel in an orbit that is an oval shape. The pull of the sun's gravity holds the planets in their orbits.
4.
How much farther from the Sun in Venus compared to Mercury?: Mercury is about 58 million km from the sun. Venus is 108million kms from the sun, so 50 million km farther.
5.
In what ways are Jupiter and Saturn alike?: They are both mostly made of gas.
6.
orbit: the path of any object in space that revolves around another object in space
7.
planet: 
a large body of matter that revolves, or travels, around any star
8.
solar system: 
the sun, the nine planets and their moons, and other objects that revolve around the sun
9.
What makes life on Earth possible?: It has the mild temperatures, liquid water and atmosphere that living things need.
10.
Which of the nine planets are inner planets?: Mercury, Venus, Earth and Mars.
11.
Which of the nine planets are outer planets?: Jupiter, Saturn, Uranus, Neptune and Pluto.
12.
Which of the outer planets is not a gas giant?: Pluto
13.
Why does the surface of the Earth keep changing?: because the surface of the earth is broken up into sections called plates. The plates constantly move.
14.
Why is the sun so bright and hot?: It is bright because it is much nearer to the earth than other stars. One form of energy it releases is in the form of sunlight . It is hot because the gas particles collide and release energy in the form of light and heat.
