Recent content by airbourne

Thanks, I had wondered if there was a simple law I wasn't thinking of, and thanks ghswllsjr for the link, I can gain a better understanding this this. Sorry for asking something that's been covered, I didn't find anything when I searched.

I have another question (I asked one a month ago, thanks to those who helped clarify it for it). I have not studied physics formally, I am just avidly interested. Situation: You have a very rigid rod, 100 light years long. You, and a friend, at the other end of the rod, 100 light years...

Thanks for the replies everyone (especially yuiop). This is much clearer now and I can put to rest something that has been bugging me (in the back of my mind) for a long while.

I can fathom that, but what happens to your communication, which essentially occurs at the speed of light which is constant and does not depend on an observer? If the person moving speaks for the 5 minutes it takes them to reach reach the speed of light, what does the observer hear? I feel...

I first pondered this a number of years ago but I've never formally studied physics or known anyone who has, so I've had no one to ask and it falls into the back of my mind for years at a time before I revisit the thought. I'm sure this is a question physics students deal with in some form...

Thanks for the link Radrook. At least the amount of mass added per year is calculable.

Google Earth 5 introduced 3D models of the ocean floor. Is that sufficient?

A few posts in here have raised a a question (simple curiosity). Does anyone have information of the volume of matter entering Earth annually (dust etc) compared to the volume of matter we've put into orbit/sent permanently into space? I would assume much more mass is leaving the Earth than...