(Just an idea) Besides a time capsule, there is one other way where the future would be able to literally look into the past. If a giant mirror was put far enough away from earth so that the reflection takes 7.5 years to get to it then the future(assuming they look through a very powerful microscope) could look at it and see 15 years into the past.
tmac7318 tmac7318
18-21, M
1 Response Aug 18, 2014

telescope*