Globular Cluster M28 (also known as Messier Object 28, Messier 28, M28, or NGC 6626) is a globular cluster in the Sagittarius constellation. It was discovered by Charles Messier in 1764. M5 is at a distance of about 18,000 to 19,000 light-years away from Earth. A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ... Sagittarius (♐, and Latin for Archer) is a constellation of the zodiac, commonly depicted as a centaur drawing a bow. ... Jump to: navigation, search Charles Messier Charles Messier (June 26, 1730 – (April 12, 1817) was a French astronomer who in 1774 published a catalogue of 45 deep sky objects such as nebulae and star clusters. ... 1764 was a leap year starting on Sunday (see link for calendar). ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... Jump to: navigation, search Earth, also known as the Earth, Terra, and (mostly in the 19th century) Tellus, is the third-closest planet to the Sun. ...

In 1987, M28 became the second globular cluster where a millisecond pulsar was discovered (the first was Globular Cluster M4). Jump to: navigation, search 1987 is a common year starting on Thursday of the Gregorian calendar. ... Jump to: navigation, search Composite Optical/X-ray image of the Crab Nebula pulsar, showing surrounding nebular gases stirred by the pulsars magnetic field and radiation. ... Globular Cluster M4 (also known as Messier Object 4, Messier 4, M4, or NGC 6121) is a globular cluster in the Scorpius constellation. ...

External links

• Globular Cluster M28 @ SEDS Messier pages