4 ms·
There isn't any research, but only cuz it's damn impossible. The number of photons ever emitted by Earth in the distant past which are gonna ever come back to E
by hugh3 15y ago
There isn't any research, but only cuz it's damn impossible. The number of photons ever emitted by Earth in the distant past which are gonna ever come back to Earth is... very very small.
- ignifero 15y agoYet, since there are not many similar atmospheres in the region, if there were any backscattered radiation it wouldn't be impossible to detect.