Planet Facts

Planet Size

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.

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

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

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

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.

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

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

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

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.

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

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

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

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.

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

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

Neptune Surface Pressure: Known Gravity: -11 Length of day: - .673 Diameter: 49,528 km Temperature: - 200 C

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