11.   The meteors are visible from Earth because as the planet orbits the Sun, it intersects every August the elongated orbit of Comet Swift-Tuttle.

12.   To have the right temperature to support life, they said, a planet must orbit its star at just the right distance.

13.   Two and possibly three planets are orbiting the pulsar, in an environment of intense radiations that presumably precludes life there.

14.   When enough large planets orbit a star in proximity, perhaps they generate a gravitational slingshot that projects the planets into elongated orbits.

15.   Who or what the political planets will orbit now is up for grabs.

16.   If no planets are orbiting the star, the dust will disperse.

17.   NASA said that until the sighting, all the detected planets have been orbiting middle-aged stars.

18.   Should Earth-size planets orbit brown dwarfs, they are likely cold, dark and inhospitable to life.

19.   The planets orbit in the same plane, like grooves in a phonograph record, only at different distances from the sun.

20.   Gatewood also found evidence of a smaller, second planet orbiting the star.