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).
One parsec is about 3.09 Ã 1016m so Î± Cen is about 1.3 parsecs distant. This is also equal to about 4.3 light years. A light year is simply the distance that light travels in a vacuum in one Earth year (9.46 Ã 1015m). One parsec = 3.26 light years. All the stars visible to the unaided eye in the night sky are relatively bright stars in our local region of the Milky Way.