Last night Bizibilder added a further 3 hours 10 minutes of exposures to his “Bubble Nebula” project. He has combined these images with the ones taken on the 8th September (1 h 55 min) to make a total exposure time of 5 hours and 10 minutes. This has reduced the background noise quite a bit and is probably as far as he can go as he would have to double the exposure time again to get a noticeable difference! (Click to enlarge). By the way – the bubble is caused by a shock wave from a central star blowing a “bubble” into the interstellar dust.