1.   Kepler first discovered the elliptical orbits of the planets.

2.   The earth moves around the sun in an elliptical orbit.

3.   But not all the planets in elliptical orbits are in binary systems.

4.   But the Phase III generation of satellites, which were intended to travel in high elliptical orbits to provide better coverage, has suffered a series of embarrassing mishaps.

5.   Chandra is to spend at least five years in a highly elliptical orbit that will carry it one-third of the way to the moon.

6.   Io, much closer to Jupiter and moving in a slightly elliptical orbit, is alternately squeezed and stretched.

7.   Isaac Newton made his contribution to the invention of calculus while trying to prove that celestial bodies always travel in elliptical orbits.

8.   Later, an internal rocket added to the observatory would stabilize it in an exaggerated elliptical orbit.

9.   Most asteroids lead a benign existence, content to linger in their main belt between Mars and Jupiter, following an elliptical orbit around the Sun.

10.   Q. Why are the planets in elliptical orbits around the Sun?