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Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
In this map of the Observable Universe, objects appear enlarged to show their shape. From left to right celestial bodies are arranged according to their proximity to the Earth. This horizontal (distance to Earth) scale is logarithmic.
In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN) [2] to catalog and standardize proper names for stars. The WGSN's first bulletin, dated July 2016, [3] included a table of 125 stars comprising the first two batches of names approved by the WGSN (on 30 June and 20 July 2016) together with names of stars adopted by the IAU Executive Committee ...
To the IAU, name refers to the (usually colloquial) term used for a star in everyday speech, while "designation is solely alphanumerical" and used almost exclusively in official catalogues and for professional astronomy. Many of the names and some of the designations in use today were inherited from the time before the IAU existed.
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
Black holes are often viewed as inescapable vortexes, but, in a recent talk at Harvard University, Stephen Hawking suggested they might be more like portals than prisons, reports the Boston Globe. ...
The quotes from the World Trade Center site can be found in September Morning: Ten Years of Poems and Readings from the 9/11 Ceremonies New York City, compiled and edited by Sara Lukinson.
There are actually four images; the fourth is faint. Cloverleaf: From its appearance having similarity to the leaf of a clover. It has been gravitationally lensed into four images, of roughly similar appearance. Teacup Galaxy: The name comes from the shape of the extended emission, which is shaped like the handle of a teacup.