If the Sun suddenly disappeared, and radioactive decay inside Earth stopped?

Question

the temperature will rapidly go down to almost absolute zero.

Then, how would the surface of Earth look like?

Answer 1

Pretty much a flat sheet of frozen water and gasses (that used to be the atmosphere)

Doug

Answer 2

I know that the reason Lord Kelvin was soooo far short in his estimation of the age of the Earth was because he didn't know about radioactive decay inside the earth.

The surface of the earth would be..........I don't know......~80% liquid or solid nitrogen and ~20% liquid or solid oxygen. And it would be about ~75-100 meters high.