[harshulpandav]

Could be possible if a 4 light year wide telescope is sent via a worm hole to one of the galaxies in the Virgo cluster (65m light years away) and live imagery of Earth (not via worm hole) is sent back via the worm hole to Earth.

[csomar]

Not needed. Once we can determine the starting composition of the universe, and have enough quantum computing power, we'll be able to simulate the past... and the future too. So you can see what your home looked like in the past and what it'll look like in the future.

[shrikrishna]

Maybe, maybe not. We do not yet know that our Universe is a closed system