1 Massage the twitch muscle with your finger for 15 seconds. 2  Usually there are other muscles that twitch like leg cramps, so take 500mg of magnesium citrate capsule daily. 3  If you have headaches, massage the knot at the back of your neck for release.
Â­So to measure really long distances, people use a unit called a light year. Light travels at 186,000 miles per second (300,000 kilometers per second). Therefore, a light second is 186,000 miles (300,000 kilometers).
Best Answer: A light year is the distance light can cover in a vacuum in one year. A light year is equivalent to 5,878,625,373,183.61 miles. A lot, huh? Light years are used to measure distances in space because it makes it easier to describe distances, since one would be using smaller numbers. For example, rather than saying a star is 23,514,501,492,734.44 (23 trillion) miles away from the Sun, you could just say the star is 4 light years away. Source(s):