A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion …

This activity can be used in conjunction with the StarChild Universe Level 2 information OBJECTIVES: Examine ways of measuring distance Make inferences regarding space travel Identify the distance …

A ACCREDITED An educational institution which has been recognized as maintaining standards that qualify graduates for admission to higher, or more specialized, institutions or professional practice.

A galaxy contains stars, gas, and dust which are held together as a group by gravity. There may be millions, or even billions, of stars in one galaxy. There are billions of galaxies in the universe. …

The words " solar system " refer to the Sun and all of the objects that travel around it. These objects include planets, natural satellites such as the Moon, the asteroid belt, comets, and meteoroids. Our …

AUDIO: none. VIDEO DESCRIPTION: Animation of a cometary fragment with two outgassing areas tumbling through space toward Jupiter. Ahead of it are several other fragments which impact the …

AUDIO: none. VIDEO: Artist's conception of a black hole with swirling accretion disk surrounding it. Jets (perpendicular to the disk) come out of the central black hole. Point of view moves in toward the …

children. Particularly my science teachers because I went into science. But not just science teachers.

This picture, taken by the Voyager 2 space probe, shows the southern hemisphere of Triton.

VIDEO DESCRIPTION: Video footage of fireball streaking across the sky, breaking up into seperate smaller fireballs. Animation of path of fireball over a map of the Eastern United States. Fireball tracks …