3 ms·
Catching up with the light that left Earth 2000 years ago may be a challenge... you'll have to hurry! Unless someone has conveniently left a large mirror 1000
by jfk13 4y ago
Catching up with the light that left Earth 2000 years ago may be a challenge... you'll have to hurry!
Unless someone has conveniently left a large mirror 1000 light-years away, so you can stay home and watch the reflection?
- koheripbal 4y agoI wonder if such an echo might exist at least for RF emissions from Earth?