Thank you all for your responses! I haven't studied physics since high school (and that was done about 10 years ago), so while I do not completely understand your responses, I do understand that there are logical explanations that I would need more study to understand. I feel like you've all...
Speed can only be measured relative to some other object, like the speed of a tennis ball during a match at Wimbledon can only be measured relative to the ground, or a cloud, or the planet Mars.
On the other hand, time is relative. An object traveling at speeds approaching the speed of light in...