| A | B |
|---|
| Astronomical Unit | A unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles),  |
| Cloud | A mass of tiny water droplets or ice crystals suspended high in the atmosphere.,  |
| Decomposed | To become broken down into components,  |
| Extra Solar Planet | Is a planet outside the Solar System.,  |
| Geophysical | Pertaining to or showing the arrangement or mode of attachment of the atoms that constitute a molecule of a substance,,  |
| Infiltration | A process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection); the slow passage of a liquid through a filtering medium,  |
| Maria | A dark region of considerable extent on the surface of the moon.,  |
| Neptune | The eighth planet from the sun, having a sidereal period of revolution around the sun of 164.8 years at a mean distance of 4.5 billion kilometers (2.8 billion miles), a mean radius of 24,000 kilometers (15,000 miles), and a mass 17.2 times that of Earth.,  |
| Plain | A broad, flat landscape region at a low elevation, usually made of layered sedimentary rocks.,  |
| Radio Telescope | Astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extraterrestrial sources.,  |
| Saturn | A giant planet that is surrounded by three planar concentric rings of ice particles; the 6th planet from the sun.,  |
| Solar Mass | A unit of mass used to express the mass of stars and larger objects such as galaxies.,  |
| Temperature Inversion | A thin layer of the atmosphere where the normal decrease in temperature with height switches to the temperature increasing with height.,  |
| Uncomformity | A lack of conformity; A gap in time in rock strata, where erosion occurs while deposition slows or stops.,  |
| Weather | The changing condition of the atmosphere, with respect to heat cold sunshine rain snow clouds and wind.,  |
