Some of the more expensive cameras lets you to extend your exposure time even for few seconds (Sony 505V up to 8 sec).
That's cool, but when you actually try it, your image will be .... full of stars! Tiny little white dots, all over.

But these are not stars, of course... These are Hot Pixels.

HotPixel Eliminator is here to fight against HotPixels!

It will successfully remove most of the HotPixels traces. You could also use Dark Night Shots option to remove additional "blue" noise chunks. These will appear in extremely long exposures (6-8 sec).

HotPixel Eliminator uses a special custom made procedures - and thanks to them HotPixels is not only the best Hot Pixels removal, but also the fastest.