orbital-belt density
21Asteroid family — An asteroid family is a population of asteroids that share similar orbital elements, such as semimajor axis, eccentricity, and orbital inclination. The members of the families are thought to be fragments of past asteroid collisions. General… …
22Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
23Ganymede (moon) — Ganymede Image of Ganymede s anti Jovian hemisphere taken by the Galileo probe. Lighter surfaces, such as in recent impacts, grooved terrain and the whitish north polar cap at upper right, are enriched in water ice. Discovery …
24Rings of Saturn — The full set of main rings, imaged as Saturn eclipsed the Sun from the vantage of the Cassini spacecraft on 15 September 2006 (brightness is exaggerated). The pale blue dot at the 10 o clock position, outside the main rings and just inside the G… …
25Earth — This article is about the planet. For other uses, see Earth (disambiguation). Earth   …
26Dwarf planet — Not to be confused with Minor planet. Ceres as seen with the Hubble Space Telescope. It is the only dwarf planet in the asteroid belt …
27Pluto — /plooh toh/, n. 1. Class. Myth. a name given to Hades, under which he is identified by the Romans with Orcus. 2. Astron. the planet ninth in order from the sun, having an equatorial diameter of about 2100 miles (3300 km), a mean distance from the …
28Phobos (moon) — Phobos Enhanced color view of Phobos obtained by Mars Reconnaissance Orbiter on March 23, 2008. Stickney crater, the largest, is on the right side. Discovery Discovered by …
29Definition of planet — Photograph of the crescent planet Neptune (top) and its moon Triton (center) …
30Trans-Neptunian object — A trans Neptunian object (TNO) is any object in the solar system that orbits the sun at a greater distance on average than Neptune. The Kuiper belt, scattered disk, and Oort cloud are three divisions of this volume of space.The orbit of each of… …
