The green streak of Comet Lulin will be bright and visible in the night sky for the next few days. After reaching the point in its orbit closest to the Sun (the perihelion) back in January, Lulin reached its closest to Earth on February 24th. This point is less than half an astronomical unit from us, meaning less than half the average distance from the Earth to the Sun.
Comet Lulin will be moving quickly across the night sky, so if you stand outside long enough you can see its movement. It will be easy to recognize because of its green color, which is caused by the reflection of the Sun's rays off the carbon gases in the comet's Jupiter-sized atmosphere.
Lulin was likely much greener when it was at its perihelion, but at that time it could not be seen with the naked eye. Now, at a position so close to Earth, the comet will likely be able to be seen without a telescope. But if you have trouble, a pair of binoculars or a camera with a good zoom should do the trick.
Check out this video to learn how to find Comet Lulin. The guy's voice reminds me of Ben Stein's character from "Ferris Bueller's Day Off," but it's an interesting clip all the same.
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