Just FYI, The circumference of earth is roughly 4 * 10^7 metres, and the speed of light is 3 * 10^8 m/s, so light can actually circle the globe almost 7.5 times per second.
The depths of the oceans are just a few milliseconds away (40ms -ish?).
The depths of the oceans are just a few milliseconds away (40ms -ish?).
http://www.wolframalpha.com/input/?i=time+for+light+to+trave...
40 µs, not ms.
(off topic.. can anyone get wolfram alpha to answer that in one query?)