[mcbutterbunz]

In addition to all the other replies on this topic, monochrome sensors are capable of higher detail and higher sensitivity than color sensors. There's no scientific benefit to using a color sensor. In fact, a color sensor would be detrimental.

[kryptiskt]

Yes, no professional telescope uses a color sensor, because the on-chip filters on those are terrible and doesn't go away when you don't want color. All color images are either done by combining images with different filters or are false color images.