A comet is a mix of rocky material, water ice, and a variety of other ingredients (as pictured here). Try out making some different comets and launch them into orbit around the Sun!
Many of you (222 kids especially) had a ton of questions about sending animals into space. Now you can learn more about the history of monkeys in space. Click on the picture to see National Geographic’s 50th Anniversary photo gallery.
Here’s a website I can’t believe I haven’t found earlier. You can type in your weight and find out how much you weigh on other planets, the moons of Jupiter, even the Sun and other stars.
Click on the picture of Lisa’s weight on other planets to try it:
Weight is really all about gravity. I would weigh only about 9 pounds on Pluto, but 3,790 pounds on the Sun. Yet I would not be any bigger or smaller sized.
Ever wondered how many Earths would add up to one Jupiter? How many Saturns would balance out one Sun? Find out with one of our favorite websites ever, the Planet Mass Comparison. Click one of the pictures below to try it yourself:
One Neptune = 9,501 Plutos!
14 Earths = 1 Uranus.
OK, OK, there’s actually no cosmic scale out in space weighing planets. This is actually measuring mass, which is a bit different than weight. Weight depends on where you’re standing. For example, you’d “weigh” a LOT more if you were on Jupiter or the Sun. (Not that you would survive long enough to get on a scale.) You even weigh a tiny bit less when you’re up in the mountains than you would at sea level. But you are the same size, with the same amount of “matter” inside your body, no matter where you are.
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