Near-infrared image known by some as the ³Hand of God² shows gas rushing away from the region with the infrared protostars at the bottom of the top picture.  The bottom picture is another infrared image where BN stands for Becklin-Neugebauer object, a hot B star just reaching the main sequence.  The Kleinmann-Low nebulae, KL, is a cluster of cool young protostars detectable only in the infrared.  Remember Weinıs law, hotter things are bluer and cooler things are redder, and even cooler things are infrareder. The BN and KL stuff is an example of astronomical minutia (I will  not ask you a question on this on an exam.  But the illustration of Wienıs law here is important in that Weinıs law is very likely to appear on both the midterm and final exams.