It's only seen once every 100,000 years - and this week is your last chance to catch a glimpse of the Comet PANSTARRS.
Photographer Mark Gaston took this timed-exposure image of the comet over Corfe Castle on Tuesday night - it's in the bottom left portion of the picture.
Although it's not really possible to see it with the naked eye any more, you should still be able to see it through binoculars if you manage to find a dark spot away from too much light pollution.
Mark says the easiest way to find the comet is to note where the sun sets and then look in the same direction around 9.15 pm, just as it is getting dark. Then sweep the sky to the right of this position with a small pair of binoculars just above roof/tree level .
As the comet fades this week it's going to pass the Andromeda galaxy in the night sky.
The comet is over 100 million miles from earth while the galaxy is over 2.5 million light years away but both are visible through binoculars as patches of light .
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