NGC 2392：双层的行星状星云
2020 February 16 NGC 2392: Double-Shelled Planetary Nebula Image Credit: NASA, ESA, Hubble, Chandra; Processing & License…
NGC 2393
2020 February 16 NGC 2392: Double-Shelled Planetary Nebula Image Credit: NASA, ESA, Hubble, Chandra; Processing & License…