their orbits
Ellipses are a scientific word for the shape of an oval. for example the planets orbits are ellipses.
Twilight
The 8 planets orbit around the Sun, in ellipses.
Kepler did not discover ellipses. In 1605 he discovered that the orbits of the planets were ellipses rather than perfect circles.
ellipses.
Ellipses
Kepler discovered that the planets orbit the sun in oval shaped paths called ellipses.
ellipses
The first person to do this was Kepler.
The planets move intheir ellipticalorbits becauseof the gravitation of the Sun combined withthe inertial velocity of the planets(tangentialto their orbital paths). Mathematics shows the resulting orbits must be ellipses. (Some of the ellipses are in factalmost circles.)
They move around the Sun in ellipses - just like the planets.
One of the discoveries that led to the modern view of the Solar System was that the orbits of the planets were ellipses. This was one of the key contributions from Johannes Kepler's laws of planetary motion, which replaced the earlier belief that planetary orbits were perfect circles.