HST Hubble Space Telescope NASA
4.1 Near Infrared Camera and Multi-Object Spectrometer 4-1 4.1.1 Instrument Description 4-2 . 3-7 Helix Nebula the closest planetary nebula to Earth 450 light-years away in 3-8 . each tail stretches 100 billion miles. 3-8 Astronomers used a combination of image-processing techniques to create this 3-9 stunning image of Eta Carinae a .