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GLOSSARY > B - Pg. 232

232 Glossary is liberated in the form of heat, allowing accretion disks to be very hot and luminous. Afterglow: light detected across the electromagnetic spectrum after the GRB itself has ceased. Ångström (Å): a unit of length equal to 10 -8 cm. Angular diameter distance: the effective distance such that the apparent size of an object decreases inversely proportional to its distance from an observer. Arcminute: a measure of angular distance. One arcminute is 1/60th of a degree. The two headlights of a car about twelve miles away would appear to be separated by 1/3 arcminute; the typical human eye would be just incapable of discerning that