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def. the sun together with all the planets and other bodies that revolve around it. what is it? |
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def.2 the science that deals with the material universe beyond the earth's atmosphere. what is this ? |
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def.3 | the act of rotating; a turning around as on an axis. |
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def.4 a round or cycle of events in time or a recurring period of time. |
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def.5 | | the line about which a rotating body, such as the earth, turns. |
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def.6 | | the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun. |
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def.7 the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox). |
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def.8 either of the two times a year when the sun is at its greatest distance from the celestial equator: about June 21, when the sun reaches its northernmost point on the celestial sphere, or about December 22, when it reaches its southernmost point. |
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def.9 | | the obscuration of the light of the moon by the intervention of the earth between it and the sun (lunar eclipse) or the obscuration of the light of the sun by the intervention of the moon between it and a point on the earth (solar eclipse). |
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def.10 the force of attraction by which terrestrial bodies tend to fall toward the center of the earth. |
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def.11 a natural body that revolves around a planet; a moon. |
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def.13 a similar phenomenon with respect to any other planet and either its satellite or the sun. |
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def.14 a self-luminous heavenly body; star. |
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def.15 A terrestrial planet, telluric planet or rocky planet is a planet that is primarily composed of silicate rocks. |
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def.16 They are basically gigantic gas balls compared to Earth and the other three rocky inner planets, or to the icy "dwarf planets" (Main-Belt asteroid Ceres and Pluto and its ice moon Charon, which are also classed as large Edgeworth-Kuiper (E-K) Belt objects). |
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def.17 | a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and gas that may form a tail that streams away from the sun. |
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def.18 | the region of space between the orbits of Mars and Jupiter in which most asteroids are located. |
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def.19 any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in diameter that revolve about the sun in orbits lying mostly between those of Mars and Jupiter. |
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def.20 | any of the small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor |
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def.21 a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid. |
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def.22 a transient fiery streak in the sky produced by a meteoroid passing through the earth's atmosphere; a shooting star or bolide. |
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def.23 a mass of stone or metal that has reached the earth from outer space; a fallen meteoroid. |
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