FTP name this supernova remnant that holds the distinction of being the first entry in Messier's catalog.
In 1921, this object was determined to be expanding at approximately .2 arcseconds per year by comparing photographs of it from a decade apart. It is known for emitting synchrotron radiation across the entire measurable spectrum as a result of electrons traveling at high speeds through the intense magnetic fields generated by the pulsar at its center. Located in the constellation Taurus, this object is also notable for the event that created it, at the time called a "guest star" that was reportedly visible in daylight for 23 days in the year 1054 CE. FTP name this supernova remnant that holds the distinction of being the first entry in Messier's catalog.
In 1921, this object was determined to be expanding at approximately .2 arcseconds per year by comparing photographs of it from a decade apart.
Crab Nebula [accept M1 before "first" is read]