астероид (кіші планета, планетоид)

астероид (кіші планета, планетоид)

Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, with a diameter of 1,003 km. It is estimated that there may altogether be no fewer than 40000. A few have very elliptical orbits and cross the orbits of several other (major) planets. One or two even have their own satellites (moons.)

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同义词： atmosphere_₁₀
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行业/领域：天文学
类别普通天文学
Company: Caltech
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One of about a dozen of the strongest Fraunhofer lines seen in the Solar spectrum, the A band at 7600 angstoms is due to telluric lines of molecular oxygen in the Earth's ...

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Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are ...

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Trojan asteroid (60° ahead of Jupiter. It was the first Trojan to be discovered.

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The number of protons in an atom's nucleus. This determines the type of element.

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the light produced by excited atoms and ions in the upper atmosphere of a planet

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天文学; 普通天文学

1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. 2) Directional ...