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into Jupiter’s atmosphere between July 16 and 22, 1994. The impacts showed up as dark spots, which then developed into a dark
belt. They helped astronomers understand more about the Jovian atmosphere.
Shooting star
A meteoroid burning up in the Earth’s atmosphere. It is believed that 100 million meteoroids produce shooting stars every
 Shoemaker-Levy 9 Comet—The comet’s 21 icy fragments stretched across 1.1 million km of space, or three times the distance between Earth and the Moon.
Skylab
day. Most of them are less than a centimeter across.
Sirius
The common name for the star Alpha Ursae Majoris and the brightest star in the sky.
Skylab
A NASA space station launched in 1973. It was made of the converted upper stage of a Saturn V rocket. After it had been used by three space crews, it was allowed to reenter the Earth’s atmosphere and burn up.
 Saturn—A Saturnian “family” picture using images of Saturn and six of its 18 moons. It shows Dione
in the foreground with Saturn behind, then Tethys
and Mimas to the right, and Enceladus and Rhea off Saturn’s rings to the left. Titan is shown furthest away at the top and also in the picture below.
 Saturn—Saturn, showing the most prominent rings.
 Saturn—A close-up of Saturn’s clouds.
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