How it works results The Keck telescopes have the most modern and complex adaptive optics on Earth. The computer controls the postion of each of the 35 mirror segments twice every second. In addition, a small, deformable mirror in the light path changes its shape 670 times per second to cancel out atmospheric distrotions. Result is an image 10 times sharper than without the adaptive optics. Read about it here .
Some objects emit very little or no visible light, but do emit radio signals.
Sagittarius has a hungry black hole as a companion. Only 1,600 light-years away, it is the closest known black hole. Rapidly drawing material from the star, the black hole caused an outburst of X-rays, light and radio waves. 1 trillionth of a watt. Should last 10 years.