If you get a chance tonight, look up at the night sky to see Neowise, the brightest comet to grace the Northern Hemisphere in decades. The comet is expected to make its closest approach tonight, passing at a distance of 64 million miles. You can spot Neowise after sunset, below the Big Dipper in the northwest sky. If you don't catch Neowise this time around, you won’t get another chance—it will be approximately 6,800 years before the comet returns to the inner parts of the Milky Way. Here are so

Comets are small, icy objects that orbit our Sun. The majority of them orbits the Sun at an area called the Oort cloud. Learn about how these objects formed and how they ended up there. | Free AstroScience