GALLERY u ENTER THE CAVE Patrick Winkler Also known as Sh2-155, the Cave Nebula is a dense interstellar cloud that's ablaze with star formation. It lies roughly 2,400 light-years away in Cepheus. DETAILS: TeleVue NP 127fli apochromatic refractor and FLI Microline MLx694 monochrome CCD camera with hydrogen-alpha filter. Total exposure: 120 minutes. q MANY SPLENDORS Terry Robison Located just 1¼° from the Lagoon Nebula in Sagittarius, IC 4685 is a complex mix of emission and reflection nebulae. For example, NGC 6559 is lower left of center. DETAILS: RC Optical Systems 10-inch astrograph and SBIG STL 11000m CCD camera with Astrodon LRGB filters. Total exposure: 10¼ hours. 76 N O V E M B E R 2 0 17 * S K Y & T E L E S C O P E