Here is an image I shot a few years ago that is a good example of an LRGB combination image...this is M31 - The Andromeda Galaxy. M31 is about 2.5 million light years away but that is very close to us. It is estimated that there are 1 trillion stars in M31. Hubble has done extensive imaging of this galaxy and has detected over 100 million stars. That sounds like a lot but our galaxy, The Milky Way, is actually larger than Andromeda. This is an LRGB image, meaning I shot this through 4 filters, Luminance, Red, Green, and Blue. 200 minutes of L, 60 minutes each of R,G,B. This was taken from my observatory at Deerlick Astronomy Village using a 14 inch DSI telescope and Apogee camera. Just imagine how many planets there are circulating those 1 trillion stars, and how many of those planets have life.