Not quite sure why this hits the front page. Most serious astrophotographers have been using similar setups for a while now, or ideally peltier cooled CCDs (like Starlite Express, Atik or QHY cameras). More recently cooled CMOS sensors (like the ZWO1600MM-Cool) have also gained popularity. It's a bit of niche market, but for long exposure photography having a cooled sensor greatly reduces thermal noise. And since the signal is very faint you often do a lot of "histogram stretching", bringing out the signal, but also the noise. In addition to having a low noise camera you also often do things like bias, dark and flat callibration, reducing impurities further. Dark subtraction is often known as "long exposure noise reduction" in consumer cameras, but astrophotographes like to do it manually. There are a lot of details to consider when doing astrophotography, but I'm always happy I can set my CMOS or CCD (own both the QHY10-OSC and ZWO1600MM-Cool) to a deltaT of -40ºC.