A celestial event – so rare it happens just 13 times in a century – is going to have all eyes looking skyward beginning Monday, May 9, ABC News reported Wednesday. Mercury, the planet closest to the sun, will begin to transit the sun beginning at 7:12 a.m. ET, the report said. Mercury will slowly journey across the face of the sun, appearing as a small black dot to people on Earth viewing the transit through a telescope or high-powered binoculars with solar filters, which NASA recommends on its website. The astronomical event, where the planet will transit across the face of the sun, will take 71/2 hours. When completed, the planet will exit the sun’s glow at 2:42 p.m. ET, according to NASA....