The Solar System - Vocabulary 1

anything that is earth-like
to move around a planet in a circle or ellipse
system of millions of stars and planets
when you cannot see parts of the sun because the moon is inbetween
gas that is lighter than air and used in balloons
line of light from the sun
the centre of hydrogen atoms join together to create energy
gas that is produced when people and animals breathe out
inner part of a planet
person who studies the stars and the planets