актиниум

актиниум

soft, silvery-white, radioactive metal which glows in the dark

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Kalbos dalis: noun
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Pramonės šaka / sritis: Astronomy
Category: General astronomy
Company: Caltech
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Astronomy; General astronomy

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 ...

А жұлдызы

Astronomy; General astronomy

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 ...

Ахиллес

Astronomy; General astronomy

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

атомдық нөмір (заряд нөмірі)

Astronomy; General astronomy

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

поляр шұғыласы

Astronomy; General astronomy

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

азимут

Astronomy; General astronomy

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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Pramonės šaka / sritis: Holiday Category: Unofficial holidays

Ұлы Американдық Шегу

Observed every year since 1977, the Great American Smokeout takes place on the third Thursday of November. Sponsored by the American Cancer Society, ...