Recent content by childsy

This question might not belong in this category, and it may seem a bit of an out there question also... Based on the principals of relativity, if aliens are real (that i hope so), wouldn’t they come back to their planet far into the future after visiting our own planet?? I ask this because they...

Why is fuel still needed in space? If space consists on nothingness, why would a rocket need fuel to gain momentum? For example, if you were to hit a golf ball in space, it would keep going and going right? So besides a gravitational pull from the Earth that the rocket initially needs to escape...