Some 6,000 light-years distant lies the Prawn Nebula (IC 4628), a massive stellar nursery within the constellation Scorpius. IC 4628 is an emission nebula, meaning that its gas is energized thanks to radiation from nearby stars. The energy it absorbs is then re-emitted in the form of infrared light. Unfortunately, despite spanning some 250 light-years and taking up the equivalent of four times the size of the Full Moon in our sky — the human eye can’t detect this type of light, rendering the nebula all but invisible to our sight.