If we are travelling with the speed of light, can we see whats
behind us(like if we are moving away from earth can we able see
the earth)? And how we see the things that we are approaching
with speed of light? Does the things look like fast forwarding
because we are moving and the source also sending photons with
the same light speed. closed as not a real question by Ϛѓăʑɏ
βµԂԃϔ, Manishearth♦ Feb 6 at 15:28 It's difficult to tell what
is being asked here. This question is ambiguous, vague,
incomplete, overly broad, or rhetorical and cannot be reasonably
answered in its current form. For help clarifying this question
so that it can be reopened, see the FAQ. Remember that there are
no preferred frames in special relativity, so your question "If
we are travelling with the speed of light, can we see whats
behind us?" is exactly equivalent to asking "If something is
travelling away from us at the speed of light can we see it?".
We know the answer to this because Nature has kindly done the
experiment for us. You pr