General astronomy

General astronomy

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General astronomy

coronal hole

Astronomy; General astronomy

An area in the sun's corona that appears dark when viewed in the far UV or in the long-wavelength x-ray range. Coronal holes are believed to be associated with fast solar winds having their field ...

corona

Astronomy; General astronomy

The outermost layer of the sun´s atmosphere which is extremely hot, up to 1-1.5 million degrees centigrade, and is the source of solar winds. The corona is only visible to the naked eye during a ...

A cloud-like nebula observed in the Crab constellation which is the remnant of a supernova explosion observed in China in 1054. It contains a very young and rapidly spinning pulsar or the remnant of ...

camelopardalis

Astronomy; General astronomy

A large but faint constellation in the northern sky. The constellation was introduced in 1612 (or 1613) by Petrus Plancius. Some older astronomy books give an alternative spelling of the name, ...

black hole

Astronomy; Galaxy

An extremely compact star which has collapsed by enormous gravitational pull to overcome electric and nuclear forces. Black holes are usually formed with stars much larger than the sun as they ...

barred-spiral galaxy

Astronomy; General astronomy

A form of disc galaxy in which the spiral arms are attached to the galactic nucleus by a straight bar of stars. They are part of the Hubble classification of galaxies.

blackbody temperature

Astronomy; General astronomy

The temperature of an object if it is re-radiating all the thermal energy that has been added to it. If an object is not a blackbody radiator, it will not re-radiate all the excess heat and the ...