What has a green head, a long white tail and is a half-mile wide?

Comet Nishimura, of course.

Haven’t heard of it? That’s probably because it was only recently discovered last month by space photographer Hideo Nishimura of Japan. Stargazers in the Northern Hemisphere will have their last chance to see Comet Nishimura on Tuesday as it passes close to Earth and slingshots around the Sun back into space, not to return for another 435 years.

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Comet Nishimura is currently visible throughout the Northern Hemisphere. But it will be the most visible on Tuesday, Sept. 12, when it’s closest to Earth — a mere 78 million miles away.

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