1. Planet Facts

2. Planet Size

5. Vocabulary
Surface Pressure (bars or atmospheres) - This is the atmospheric pressure (the weight of the atmosphere per unit area) at the surface of the planet in bars or atmospheres.
Length of Day - The average time compared to Earth for the Sun to move from the noon position in the sky at a point on the equator back to the same position.

6. Mercury Surface Pressure: 0 Gravity: 3.7 Length of day: 175.9
Diameter: 4879 km
Temperature: 167 C

7. Mercury
Wind Speed: 0
Atmosphere: virtually no atmosphere, however what is there contains hydrogen, oxygen, sodium, potassium and argon.
Water: yes
Other: most iron rich planet in the Solar System

8. Venus Surface Pressure: 92 Gravity: 8.9 Length of day: 116.8
Diameter: 12,104 km
Temperature: 462 C

9. Venus Fastest Wind Speed: 1810 km/h
Atmosphere: mostly of carbon dioxide
Water: very little
Other: Billions of years ago, Venus probably had much more water.

10. Earth Surface Pressure: 1 Gravity: 9.8 Length of day: 1
Diameter: 12,756 km
Temperature: 15 C

11. Earth Fastest Wind Speed: 371 km/h Atmosphere: nitrogen and oxygen
Water: yes
Other: contains life

12. Mars Surface Pressure: 0.01 Gravity: 3.7 Length of day: 1.03
Diameter: 6792 km
Temperature: - 65 C

13. Mars Fastest Wind Speed: 93.2 km/h Atmosphere: mostly carbon dioxide
Water: most is frozen
Other: Called the red planet because of the iron oxide on the surface.

14. Jupiter Surface Pressure: Unknown Gravity: 23.1 Length of day: .415
Diameter: 142,984 km
Temperature: -110 C

15. Jupiter Fastest Wind Speed: 620 km/h Atmosphere: hydrogen
Water: trace amounts
Other: 63 moons

16. Saturn Surface Pressure: Unknown Gravity: 9.o Length of day: .445
Diameter: 120,536 km
Temperature: -140 C

17. Saturn Fastest Wind Speed : 1,800 km/h
Atmosphere: mostly of hydrogen and helium
Water : trace amounts
Other: The rings are made up of dust, gravel, snow, ice, rocks, boulders.

18. Uranus Surface Pressure: Unknown Gravity: 8.7 Length of day: 0.720
Diameter: 51,118 km
Temperature: -195 C

19. Uranus Wind Speed: 700Km/h Atmosphere: hydrogen and helium Water: Yes
Other: 27 moons

20. Neptune Surface Pressure: Known Gravity: -11 Length of day: - .673
Diameter: 49,528 km
Temperature: C

21. Neptune Wind Speed: 200Km/h Atmosphere: methane gas Water: yes
Other: Methane gives Neptune its blue cloud color.