Discovered at the end of March, the NEOWISE comet is passing within 100 million kilometres of our planet. That in astronomical terms is close, but in human terms very far, said Parshati Patel, an astrophysicist with Western Universitys Institute for Earth & Space Exploration.

So dont worry even though Patel says comets are unpredictable, this one wont ram into the Earth, as often happens in Hollywood movies and science-fiction paperbacks.

Comets are leftover chunks from the formation of a planet, she says, composed of dust, ice and rocks. Its almost like a dirty snowball in many ways, Patel said. They appear as bright spots, with a tail, in the sky.

Patel got up early this week to catch a glimpse of NEOWISE, which gets its name from the asteroid-hunting part of NASAs Wide-field Infrared Survey Explorer mission, an Earth-orbiting telescope that detected the object.

I personally went on Tuesday. It wasnt really great. There were some clouds in the sky, Patel said. We couldnt really see it with the naked eye.

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Your guide to spotting the NEOWISE comet - London Free Press (Blogs)