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an aurora ocurring in the northern hemisphere of the Earth

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行业/领域：天文学
类别普通天文学
Company: Caltech
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天文学; 普通天文学

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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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 ...

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The giant intergalactic bubble of gas floating in space. It's the remnant of a massive star explosion, or supernova, in the Large Magellanic Cloud ...