“Cygnus A”的意思、由来-百科全书

Cygnus A

astronomy

most powerful cosmic source of radio waves known, lying in the northern constellation Cygnus about 500,000,000 light-years (4.8 × 10²¹ km) from Earth. It has the appearance of a double galaxy. For a time it was thought to be two galaxies in collision, but the energy output is too large to be accounted for in that way. Radio energy is emitted from Cygnus A at an estimated 10⁴⁵ ergs per second, more than 10¹¹ times the rate at which energy of all kinds is emitted by the Sun. The source of the energy of Cygnus A remains undetermined.

词条	Cygnus A
释义	Cygnus A astronomy most powerful cosmic source of radio waves known, lying in the northern constellation Cygnus about 500,000,000 light-years (4.8 × 10²¹ km) from Earth. It has the appearance of a double galaxy. For a time it was thought to be two galaxies in collision, but the energy output is too large to be accounted for in that way. Radio energy is emitted from Cygnus A at an estimated 10⁴⁵ ergs per second, more than 10¹¹ times the rate at which energy of all kinds is emitted by the Sun. The source of the energy of Cygnus A remains undetermined.
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