An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian
فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک
M. Heydari-Malayeri - Paris Observatory
Homepagedwarf irregular galaxy kahkašân-e bisâmân-e kutulé Fr.: galaxie irrégulière naine An irregular galaxy that is much smaller than other irregulars. Dwarf irregulars are generally metal poor and have relatively high fractions of gas. They are thought to be similar to the earliest galaxies that populated the Universe, and are therefore important to understand the overall evolution of galaxies. |
irregular galaxy kahkašân-e bisâmân Fr.: galaxie irrégulière A galaxy with no spiral structure and no symmetric shape. Irregular galaxies are usually filamentary or very clumpy in shape and tend to smaller than others. Two types of irregular galaxies are defined, → Irr I galaxy and → Irr II galaxy. |
Sagittarius Dwarf Irregular Galaxy kahkešân-e kutule-ye bisâmân-e Nimasb Fr.: galaxie naine irrégulière du Sagittaire A dwarf irregular galaxy, discovered in 1977, that is a member of the Local Group of galaxies. It has a diameter of 1,500 light-years and lies about 3.5 million light-years away. SagDIG contains as much as about 108 solar masses of H I gas and is one of the most metal-poor galaxies. It should not be confused with the → Sagittarius Dwarf Elliptical Galaxy. → Sagittarius; → dwarf; → irregular; → galaxy. |
