NASA’s October 17 Astronomy Picture of the Day is a stereoscopic image of Comet 67P/Churyumov–Gerasimenko. With red-blue glasses, its jagged double-lobed nucleus appears to float in depth.
The view combines Rosetta OSIRIS images from July 25, 2015, taken about 184 kilometers away. Jets are visible coming from the comet as it neared the Sun.
The larger lobe is roughly four kilometers across and joins a smaller lobe through a narrow neck. NASA also points to a catalog of nearly 1,400 stereo views.
Action: open the full image, try anaglyph glasses if available and browse the linked image archive.