New answers tagged space-travel
Oh, why not. Unknowns aside, if an object moves towards you at faster than the speed of light, you won't see it coming, or, perhaps more accurately, you can watch it coming after it reaches or passes you, but it will look like it's moving away from you even though it's already reached you. What this means is, if aliens are planning an attack on earth and ...
Top 50 recent answers are included