[Challenge] If you could right-click the sky...

[Googolplex]

His question makes sense if he means atoms instead of pixels. This could be almost the same.
But the problem is that the human eye doesn't have a 360° view of the sky and we don't know our position in the universe.

The universe is 13,7 billion years old, that means a space of

299792,458 x 60 x 60 x 23,94 x 365,24 x 13700000000 = 129284437743762600000000 km (129,28 sextillion)

And then you have to know how many atoms per km are. This amount is very different and you also should know that an atom is not the smallest piece.

The number of atoms in the universe is 10^78.

1000000000000000000000000000000000000000000000000000000000000000000000000000000

10^100 would mean 1 Googol
10^Googol would mean 1 Googolplex