Subject |
is part of |
has surface temperature |
has acceptance statu |
has frequency |
has velocity |
has surface density |
has parallax |
has position on celestial sphere |
has symbol |
has radiation at surface |
has acronym |
has energy source |
has energy production |
has catalog |
has wavelength |
is a kind of |
has material |
has mass |
has synonym |
has definition |
has luminosity class |
obey |
dwarf | | greater than 1000 Kelvin | | | determined from proper motion and radial velocity | which depends on luminosity class | from the point of view of Earth's orbit | from the point of view of Earth | d | which is diffused out from the hotter core | | gravitational contraction and or fusion | which takes place primarily within the core | star catalog | | star | hydrogen, helium | greater than 0.08 the sun's mass | main sequence star | Star with mass equal to or less than that of the sun. More generally, any star on or below the main sequence in the Hertzprung-Russell diagram. | V | |
massive compact halo object | dark halo | | hypothetical | inversely proportional to the wavelength | | | | | | | MACHO | | | | inversely proportional to its momentum | dark matter | | | hidden mass | These are black holes, neutron stars and brown dwarfs, none of which are luminous and all of which are postulated to exist in the halos of galaxies. They are a form of dark matter. | | uncertainty principle |
black dwarf | dark halo | greater than 1000 Kelvin | hypothetical | inversely proportional to the wavelength | determined from proper motion and radial velocity | which depends on luminosity class | from the point of view of Earth's orbit | from the point of view of Earth | d | which is diffused out from the hotter core | MACHO | gravitational contraction and or fusion | which takes place primarily within the core | star catalog | inversely proportional to its momentum | massive compact halo object | hydrogen, helium | greater than 0.08 the sun's mass | main sequence star | The final stage in the evolution of a star of roughly 1 Msun. It is a mass of cold, electron-degenerate gas, and can no longer radiate energy, because the whole star is in its lowest energy state. No black dwarfs have ever been observed. Also, an object (M < 0.085 Msun) that is not massive enough to achieve nuclear chain reactions. | V | uncertainty principle |