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The Bright Star Catalogue, which is a star catalogue listing all stars of apparent magnitude 6.5 or brighter, or roughly every star visible to the naked eye from Earth, contains 9,096 stars. [1] The most voluminous modern catalogues list on the order of a billion stars, out of an estimated total of 200 to 400 billion in the Milky Way .
In 1868, he discovered carbon stars, which he put into a distinct group: [48] Red stars with significant carbon bands and lines, corresponding to modern classes C and S. Secchi class V: In 1877, he added a fifth class: [49] Emission-line stars, such as Gamma Cassiopeiae and Sheliak, which are in modern class Be.
Below are lists of the largest stars currently known, ordered by radius and separated into categories by galaxy. The unit of measurement used is the radius of the Sun (approximately 695,700 km; 432,300 mi).
The following is a list of particularly notable actual or hypothetical stars that have their own articles in Wikipedia, but are not included in the lists above. BPM 37093 — a diamond star Cygnus X-1 — X-ray source
Almost every pixel seen in the image is a galaxy, each containing billions of stars. [1] Galaxy groups and clusters are the largest known gravitationally bound objects to have arisen thus far in the process of cosmic structure formation. [2] They form the densest part of the large-scale structure of the Universe.
A stellar association is a very loose star cluster, looser than an open cluster. A moving group is the remnant of such a stellar association. [ 1 ] Members of stellar associations and moving groups share similar kinematic properties, as well as similar ages and chemical composition.
The O-B stars in the association will have burned all their fuel within 10 million years. (Compare this to the current age of the Sun at about 5 billion years.) The Hipparcos satellite provided measurements that located a dozen OB associations within 650 parsecs of the Sun. [ 8 ] The nearest OB association is the Scorpius–Centaurus ...
Star clusters are large groups of stars held together by self-gravitation. Two main types of star clusters can be distinguished. Two main types of star clusters can be distinguished. Globular clusters are tight groups of ten thousand to millions of old stars which are gravitationally bound.