1. Planets
Lesson 1

2. SOLAR SYSTEM
It is made up of sun, 8 planets, moons and others such as asteroids, meteoroids, and comets.

3. The Terrestrial Planets

4. The Jovian Planets (balls of liquid surrounded by gas)

5. Distance from the Sun (million km) Time taken for one orbit
Planet
No. of Moons
Distance from the Sun (million km)
Time taken for one orbit
Mercury - 58
88 earth days
Venus
108
225 earth days
Earth 1
150
365 ¼ earth days
Mars 2
230
687 earth days
Jupiter 67
780
11.9 earth years
Saturn 62
1470
29.5 earth years
Uranus 27
2870
84 earth years
Neptune 14
4500
164 earth years

6. Test Yourself What do you mean by Jovian planets?
Why Earth is the only known livable planet?