Both M87* and Sag A* have an apparent size of about 40 microarcseconds, which is roughly that of a baseball on the surface of the moon. To observe such a small apparent object, astronomers had to ...

Before dawn on Tuesday, March 3, the full moon will slip into Earth’s shadow and briefly glow a deep coppery red, creating a rare “blood moon” visible across most of the United States. It will be the ...

These range from the supermassive black hole in the Andromeda Galaxy to Cyg A*, which is at the heart of a radio galaxy 760 light-years away. We are decades away from operating radio telescopes on the ...