... The array could select signals from a narrow range of directions, and Ken Franklin and Bernie Burke calibrated it using a known source, the CrabNebula, then began surveying the surrounding sky. ...
... The collapsed core of the CrabNebula apparently rotates 30 times a second, because that is the frequency at which it blinks in x-rays and radio (and I believe in its light, too). ...
... The collapsed core of the CrabNebula apparently rotates 30 times a second, because that is the frequency at which it blinks in x-rays and radio (and I believe in its light, too). ...