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).
Actually I think the answer would be C. 8 earth years. The reason for this is because light years is literally the amount of time it takes for light to travel in a earth year. There is no mathematical expression needed for this, it says it in the problem. If it takes light to travel 8 years to a star its 8 earth years. The answer is C. Thank you though!