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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Actividade/ Sector: Astronomy
Category: General astronomy
Company: Caltech
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Astronomy; General astronomy

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

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Astronomy; General astronomy

A measure of the minor axis of an elliptic orbital of an electron according to the Bohr-Sommerfeld theory.

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Actividade/ Sector: Holiday Category: Religious holidays

Күлгін Сәрсенбі

Ash Wednesday is observed by Christians. Marking the first day of Lent, which lasts until Easter (a period of 46 days), it is the day of repentance. ...