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Alpha Centauri |
a double star in the constellation Centaurus, the closest star to the solar system, having a combined magnitude of -0.3. |
chondrite |
a stony meteorite that contains chondrules, formed from materials present in the early solar system . |
cosmic ray |
high energy radiation, consisting primarily of high-energy protons and alpha particles, that primarily originates from outside the solar system. Upon collision with earth's atmosphere, secondary particles can be produced that sometimes reach the earth's surface. |
earth |
(often cap.) the fifth largest planet in the solar system, which is third in order from the sun and has a diameter of about 7,930 miles. [1/4 definitions] |
Enceladus |
one of several moons of the planet Saturn, having more reflective brightness than any other body in the solar system. |
geocentric |
designating the earth as the center, as of the universe or solar system. [1/2 definitions] |
Jupiter |
the largest planet in the solar system and fifth from the sun, having sixteen satellites and a diameter of about 88,700 miles. [1/2 definitions] |
Mars |
the seventh largest planet in the solar system and fourth from the sun, having two satellites, a diameter of about 4,200 miles, and a ruddy surface that is apparent to the naked eye; the Red Planet. [1/2 definitions] |
mercury |
(cap.) the eighth largest planet of the solar system and the nearest to the sun, having no satellites and a diameter of about 3,000 miles. [1/5 definitions] |
Milky Way |
the galaxy that contains the earth, the sun, and the solar system, and that is visible in the night sky as a long ribbon of cloudlike clusters of stars from one horizon to the other. |
nebular hypothesis |
a theory stating that the solar system was once a nebula that cooled and condensed to form the sun and planets. |
Neptune |
the fourth largest planet in the solar system and eighth from the sun, having thirteen satellites and a diameter of about 31,350 miles. [1/2 definitions] |
orrery |
a model of bodies in the solar system that can show their relative positions and motions by means of simple mechanical adjustments. |
planet |
a large, nonluminous celestial body, esp. one of the nine in the solar system, that revolves around a star and often has one or more satellites. [1/2 definitions] |
planetarium |
a structure, such as a mechanical model, that represents the position or motion of objects in the solar system. [1/3 definitions] |
Pluto |
a dwarf planet in the Earth's solar system with a highly elliptical orbit and a diameter of 2,370 kilometers, or approximately 1,475 miles. Pluto was formerly considered a planet in the solar system, the smallest and farthest from the sun, but it was reclassified in 2006 as a dwarf. However, the debate about the classification continues in the scientific community. [1/2 definitions] |
Rutherford atom |
the atom regarded as visually analogous to the solar system, with electrons revolving around a nucleus. |
Saturn |
the second largest planet in the solar system and sixth from the sun, having many satellites, a diameter of about 74,500 miles, and a system of icy rings around its equator. [1/2 definitions] |
space |
the area of the universe lying outside the earth's atmosphere and containing the stars, galaxies, and solar systems; outer space. [1/12 definitions] |
sun |
(often cap.) the central star of the solar system around which the earth and other planets revolve and from which heat and light issue. [1/8 definitions] |
Uranus |
the third largest planet in the solar system and seventh from the sun, having twenty-seven satellites and a diameter of about 31,500 miles. [1/2 definitions] |
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