General astronomy

General astronomy

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General astronomy

alpha2 CVn

Astronomy; General astronomy

A spectrum variable with spectrum showing strong, profuse lines of rare earths, iron-peak elements, and Si.

Altair

Astronomy; General astronomy

(alpha Aql, HR 7557) A bright A7 V star.

30 Doradus Nebula (NGC 2070, Great Looped Nebula, Tarantula Nebula)

A giant H II region, at least 300 pc across - one of the largest known. It is larger and more luminous than any known in the Galaxy. It is the brightest object in the Large Magellanic Cloud at both ...

40 Eridani

Astronomy; General astronomy

A nearby triple system, 5 pc distant. Component A is K0 V; component B is a DA white dwarf; component C is M5e V.

47 Tucanae

Astronomy; General astronomy

A metal-rich globular cluster. It has roughly one-quarter the solar metal abundance. It has a high galactic latitude and low reddening. It is a member of the thick-disk population.

4N nucleus (even-even nucleus)

Astronomy; General astronomy

Nuclei possessing equal and even numbers of neutrons and protons. 4N nuclei are formed in supernova envelopes at temperatures of at least 2 × 109 K and are very stable.