А жұлдызы

А жұлдызы

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 present; in late A stars the H and K lines of ionized calcium appear. A0 stars have a color index of zero.

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Kategori Genel astronomi
Company: Caltech
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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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Astronomi; Genel astronomi

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 ...