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Time for a little planet-hopping! Check out the chart b e l o w for facts on Earth and the other eight planets in our solar system. YEAR (ONE ORBIT AROUND SUN) IN EARTH TIME MAIN GASES IN ATMOSPHERE PLANETS DIAMETER MERCURY 3,029 miles (4,878 km) 88 days 59 days Traces of argon, neon, helium VENUS 7,515 miles (12,102 km) 224 days, 17 hours 243 days Carbon dioxide (very thick) EARTH 7,921 miles (12,756 km) 365 days, 6 hours 1 day, 23 hours, 56 minutes Nitrogen, oxygen MARS 4,218 miles (6,792 km) 687 days, 23 hours 24 hours, 37 minutes Carbon dioxide (thin) JUPITER 88,793 miles (142,984 km) 11 years, 11 months 9 hours, 56 minutes Hydrogen, helium SATURN 74,853 miles (120,536 km) 29 years, 5 months 10 hours, 39 minutes Hydrogen, helium URANUS 31,744 miles (51,118 km) 84 years 17 hours, 14 minutes Hydrogen, helium, methane NEPTUNE 30,757 miles (49,528 km) 164 years 16 hours, 7 minutes Hydrogen, helium, methane PLUTO 1,430 miles (2,300 km) 248 years 6 days, 9 hours, 18 minutes Possibly nitrogen, carbon dioxide, and/or methane D A Y (ONE ROTATION ON AXIS) IN EARTH TIME Searching for that fun-in-the-Sun vacation spot? Check out the chart below. It shows the average distance of each planet from the Sun. MERCURY 36 million miles (58 million km) JUPITER 480 million miles (768 million km) VENUS 67 million miles (107 million km) SATURN 890 million miles (1,424 million km) EARTH 93 million miles (149 million km) URANUS 1,790 million miles (2,848 million km) MARS 140 million miles (224 million km) NEPTUNE 2,800 million miles (4,480,000 million km) PLUTO 3,680 million miles (5,872,000 million km) NUMBER OF MOONS WEIGHT OF 110-LB. (50 KG) KID CLAIM TO FAME 0 41.0 lb. (18.5 kg) Daytime temperature 880°F (470°C); nighttime -300°F (-183°C) 0 97.0 lb. (44.0 kg) Rotates east to west instead of west to east, as other planets do 1 110.0 lb. (50.0 kg) 2 42.0 lb. (19.0 kg) Only body known to have life; mild climate, water as solid, liquid, gas Ice-capped poles, four seasons, global dust storms At least 16 276.5 lb. (125.5 kg) Colorful bands of gas, marked by lightning, with auroras near poles; Great Red Spot is storm bigger than Earth At least 18 118.0 lb. (53.5 kg) Circled by colorful ice rings ranging in width from fingernails to houses 17 102.5 lb. (46.5 kg) Tipped sideways so pole—not equator—faces Sun 8 135.5 lb. (61.5 kg) Winds of 1,500 mph (930 kph) highest recorded on any planet 1 5.5 lb (2.5 kg) Tiny size, offbeat orbit; some people argue it's not even a planet Activity SPACED O U T ! Got an orange and access to a football field? Then you can create your own solar system. Put the orange on one goal line. This is the Sun. Using the chart above and a scale of 1 yard = 10 million miles, Mercury is a speck of dust about halfway between the 3 and the 4 yard lines. Now locate the positions of the rest of the planets. (Although the yard lines on a football field go from 0 to 50 and back to 0, treat them as 100 continuous yard lines.) Can you score a touchdown and place all the planets on the field? What yard line do you land on? Is there even enough room? If not, what scale would you have to use to fit all the planets on the same football field? (If you can't get to a football field, no problem. Use graph paper. One unit = 10 million miles. Use as many sheets as you need. Tape them together and make a wall chart.) Bonus: The farther the planets from the Sun, the more spaced out they are. Figure out how many times farther each planet is from the Sun than the previous one. DISCOVERY EDUCATION SCIENCE CONNECTION