Match the words below to definitions 1-10. asteroid, constellation, galaxy, meteorite, moon, planet, solar system, star, sun, universe 1 A very large round object which moves around a sun or a star, e. G. Mars. 2 The star that shines during the day and gives the Earth light and heat 3 The whole of space and everything in it. 4 A rock from space which hits the Earth. 5 A ball of burning gas in space. At night we see these as spots of light in the sky. 6 A group of stars which form a pattern and have a name. 7 A group of planets which move around the same star or sun. 8 A large group of stars and planets. The Earth is part of the Milky Way. 9 Something which moves around another planet. 10 A large rock or small planet. SPEAKING Put the words in exercise 2 in order of size starting with the smallest.

asteroid, constellation, galaxy, meteorite, moon, planet, solar system, star, sun, universe

1 A very large round object which moves around a sun or a star, e.G. Mars.

SUN

2 The star that shines during the day and gives the Earth light and heat

MOON

3 The whole of space and everything in it.

UNIVERSE

4 A rock from space which hits the Earth.

METEORITE

5 A ball of burning gas in space. At night we see these as spots of light in the sky.

STAR

6 A group of stars which form a pattern and have a name.

CONSTELLATION

7 A group of planets which move around the same star or sun.

SOLAR SYSTEM

8 A large group of stars and planets. The Earth is part of the Milky Way.

GALAXY

9 Something which moves around another planet.

PLANET

10 A large rock or small planet

ASTEROID

a: it is sound because it cites an expert’s opinion.

the correct way to cite this in apa format is the following: smith, d. (2001). world environment day. retrieved from  

apa (american psychological association) style is most commonly used to cite sources within the social sciences.  

quotation styles can differ by use and by styles and every subject has its own unique style of quotation.

explanation: