related tags: 261A22 2D1423 48373F 502E3E 66545D 6E4C5D 8D747E 9A677B C4A7B5 D299B4 astronomical astronomy dyingstar hubble hubblespacetelescope hubbletelescope nasa nebula ngc2440 planetarynebula puppis space spacetelescope superhotstar ultravioletradiation