Infected with humans

You finally get the radio telescope to yourself for an evening. With a little luck, you might get useful data for your thesis.

You turn the dishes towards the part of the sky you wish to examine.

There is a clear radio signal.

“Mission Control,” says a gravelly voice. “We are aborting the alpha-nine-one-one flyby. The system is infected with humans. Repeat, alpha-nine-one-one, is infected with humans.”