Comet ISON entered the inner solar system at a relatively shallow angle above the orbits of the planets, and then it left the inner solar system at a much steeper angle above the ecliptic. ISON spent approximately four m... More »

www.reference.com Science Astronomy Comets & Asteroids

Comet ISON broke apart as it approached the sun in November of 2013, leaving no observable fragments. On Dec. 2, 2013, NASA's team devoted to observing Comet ISON reported that the comet had disintegrated completely only... More »

www.reference.com Science Astronomy Comets & Asteroids

One of the easiest ways to make a model of a solar system is to cut circles from cardboard to represent the planets and hang them in orbits from a larger circle. Use nine circles to represent the eight planets and the su... More »

www.reference.com Science Astronomy Universe

One of the easiest ways to build a working model of the solar system is to suspend the sun and planets in their orbits from a circular piece of cardboard. Draw circles on the cardboard to represent the planets' orbits an... More »

The planets of the solar system maintain their orbits around the Sun due to its gravitational pull. Planetary orbits are determined by two forces: the Sun's gravity pulling them inwards and the inertia of their movement,... More »

Comet ISON broke apart as it approached the sun in November of 2013, leaving no observable fragments. On Dec. 2, 2013, NASA's team devoted to observing Comet ISON reported that the comet had disintegrated completely only... More »

www.reference.com Science Astronomy Comets & Asteroids

The majority of asteroids that scientists have formally identified reside between the orbits of Mars and Jupiter. Scientists call this wide swath of space the asteroid belt, and though it contains millions of objects, th... More »