relativistic

There are some people on these forums who have a much better understanding of relativistic effects than myself, so I was wondering if anyone can answer these questions, which might help me to understand it. Imagine a spaceship 189,000 miles wide, with a light source on one side and a mirror on...

I just finished reading The Forge of God by Greg Bear (scifi novel, not very good in my opinion) and I got to thinking about something. What kind of effects could you expect to see from a small mass (say 10 kg) moving at relativistic speeds (say .75c) through the atmosphere? Would it be like an...