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).
A light-year is the distance travelled by light in one year, which is 9 trillion, 460 billion, 730 million, 472 thousand and 581 kilometres. In other words, almost 10,000 billion kilometres. First, it should be said that a light year is a measure of distance, not time (which I know is a little confusing from its name!). The minimum distance between Jupiter and Earth is 588 million km (365 million miles).