Celestia Forums

Say you're traveling at 55 mph in your car with your headlights off and you turn them on. Does the light from your headlights travel at the speed of light + 55 mph?

I've had Celestia for a number of years and love it. The other day I was playing with it and while following Earth, I selected the Moon and locked the two together. Then I sped up time a few thousand years and noticed the face of the Moon changed after or about the year 4000. Is this correct? What a...

How 'bout creating a Distance to/from any object sphere. You input the distance, say 100 light years from the Earth and the program displays a sphere encompassing all object within the stated distance.