A newly-discovered green comet is zipping by Earth and is now visible for the first time in more than 400 years.
Comet Nishimura was discovered by amateur Japanese astronomer Hideo Nishimura on Aug. 11 and named after him.
Nishimura first spotted it by taking long exposure shots using a Canon digital camera and a telephoto lens.
When our solar system first formed, huge amounts of debris were left over. So what we see as a comet is a chunk of dirty ice that remains from that time.
Comets typically stay far away from the sun, frozen and impossible for us to see. But every once in a while, one will come in toward the sun.
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