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Bell Work: Observe every part of this photograph. What do you see? Be descriptive. How could it be possible to freeze on one side of a planet and burn to death on the other? Which planet fits that description? How do we know certain facts about planets when we have never visited that planet? Mercury • Closest to the sun • No moons • Extremely hot temperatures on one side and extremely cold temperatures on the other. • Now the smallest planet in our solar system 3 Mercurys = 1 Earth Mercury • Physically, Mercury is similar in appearance to our moon as it is heavily cratered. • Mercury has a rocky body like the Earth, but its atmosphere is very thin or weak. • Mercury has been visited by only one spacecraft, Mariner 10. First fly-by was on March 29, 1974. Many photos were taken and Mariner 10’s infrared radiometer was able to take measurements of the gases in Mercury’s atmosphere. Mercury’s Orbit: The first orbital path from the sun. Mercury • • • • • • Distance from sun Period of rotation Period of revolution Diameter Surface temperature Surface gravity 3.2 light-minutes 58 days, 16 hours 88 days 4,879 km -173 to 427°C 38% of Earth’s
