On a clear, moonless night, far away from any light pollution, the average person can make out several thousand stars. With binoculars or a small telescope, thousands of more stars are visible. The Andromeda galaxy is visible with the unaided eye, the furthest object that a person can see.

But what would the sky look like if humans saw in the radio spectrum?

First of all, the sky would be black day or night. The sun would be a large circle. The planets Mercury and Mars would be invisible. Jupiter would be a bright point in the sky.

Rain, clouds, and snow would have little affect at the lower longer wavelengths. The familiar constellations would no longer exist. Instead, the sky would be filled with a blaze of colors from Gamma Ray Bursts (GRB), supernovae remnants, matter falling into the event horizon of black holes, jets of plasma squirting out of galaxies.

We would see that the universe is, in fact, a very hazardous place to be.