It has a flux of about 2720 Janskies at 1 gigahertz, and is expanding at the rate of approximately ten million miles per hour.
It has a flux of about 2720 Janskies at 1 gigahertz, and is expanding at the rate of approximately ten million miles per hour. This rate of expansion is slowing, but whether the rate in the change of the rate of expansion is slowing or not is still under debate. Though one of the brightest radio sources in the sky, it was not discovered until 1947 due to large clouds of interstellar dust between it and us blocking optical observations of it. Believed to be about 350 years old, for 10 points, name this supernova remnant located in one of the circumpolar constellations.
It has a flux of about 2720 Janskies at 1 gigahertz, and is expanding at the rate of approximately ten million miles per hour.
{Cassiopeia A}