go here: eyes on the earth, to see real time satellite tracking data, as well as sea ice, CO2, global temp, sea level and ozone data levels. stunning.
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scroll through to about 21 minutes for info about sputnik, telstar and satellite tracking at mission control…guildford.
via videosift.com
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there are four main theories: spin theory, capture theory, double planet theory and large impact theory. do some research using these links.

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here’s a link to a mass/weight simulator. check out the differences between mass and weight on earth and the moon.
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