By Rebecca Robinson A comet bigger than Mount Everest is going to light up the sky in a once-in-a-lifetime astronomical event when it can be seen without a telescope. This comet is called Comet 12P/PonsBrooks, and some have likened it to the Millennium Falcon from Star Wars because of its “horns.” To find this comet, look for the Great Square of Pegasus in the west. That’s four bright stars making a big square. The comet will be making a V-shape with them, reports the Express US. The comet only comes around once every 71 years and it will be closest to the sun on April 21 and nearest to Earth …