accretion disc
31Supernova — This article is about the astronomical event. For other uses, see Supernova (disambiguation). Multiwavelength X ray, infrared, and optical compilation image of Kepler s supernova remnant, SN 1604. A supernova is a stellar explosion that is more… …
32Brown dwarf — Brown dwarfs are sub stellar objects which are too low in mass to sustain hydrogen 1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no… …
33FU Orionis — In stellar evolution, FU Orionis objects (or FUors) are pre main sequence stars which display an extreme change in magnitude and spectral type. One example is the star V1057 Cyg, which became 6 magnitudes brighter and went from spectral type dKe… …
34Gravitational microlensing — Gravitational Lensing Formalism Strong lensing …
35Kardashev scale — The Kardashev scale is a method of measuring a civilization s level of technological advancement. It was first proposed in 1964 by the Soviet astronomer Nikolai Kardashev. The scale has three designated categories called Type I , II , and III .… …
36Astronomical object — Celestial object and Celestial body redirect here. For other uses, see Celestial (disambiguation). This article is about naturally occurring objects. For artificial objects, see Satellite. Astronomical objects or celestial objects are naturally… …
37Metallicity — The globular cluster M80. Stars in globular clusters are mainly older metal poor members of Population II. In astronomy and physical cosmology, the metallicity (also called Z[1]) of an object is the proportion of its matter made …
38Debris disk — Hubble Space Telescope observation of the debris ring around Fomalhaut. The inner edge of the disk may have been shaped by the orbit of Fomalhaut b, at lower right. A debris disk is a circumstellar disk of dust and debris in orbit around a star.… …
39Egg Nebula — Protoplanetary nebula caption=RAFGL 2688, the Egg Nebula name = Egg Nebula type = epoch = J2000 ra = RA|21|02|18.75cite web title=SIMBAD Astronomical Database work=Results for Egg Nebula url=http://simbad.u strasbg.fr/Simbad accessdate=2007 01… …
40Compact star — In astronomy, the term compact star (sometimes compact object) is used to refer collectively to white dwarfs, neutron stars, other exotic dense stars, and black holes. These objects are all small for their mass. The term compact star is often… …
