Gravity - Well, how do they stay up there?
Well, how do they stay up there?
Danish scientist Tycho Brahe (1571–1630)
developed a theory of planetary motions. Then, in 1609, Johannes Keppler used Brahe's theory when he said that the planets orbited ellipticallyAn orbital path which is egg-shaped or resembles an elongated circle. rather than in a circle. An elliptical orbit is a curved path similar to the shape of an egg. Newton's laws unlocked many answers to questions scientists had been struggling with as they tried to figure out, among other things, what kept the planets orbiting in the first place.
The planets orbit and position themselves according to a balanced set of natural laws. One law is called inertiaThe tendency of an object to continue in its state of motion., the tendency of objects to continue...
[The entire page is 410 words long]
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