Hi,
First FYI, I have no education in physics.
Anyway -
I know Earth's escape velocity is about 41,000 kph. Anything less, and you'll eventually fall down back to earth.
Two points that seem to contradict each other -
1. Escape velocity gets decreased the farther away you are from the...
Hey everyone,
I get it - the faster the object is moving away from me, the more the light it emits moves to the red side of the spectrum.
But here's my question:
Here on earth, we watch galaxy A, which seems to have a very red light. How can we know it's not "originally" that red, and if it...