Optical light, shown in green, traces clumps of relatively cool gas that includes oxygen . X-rays , shown in blue, show relatively hot gas that has been heated to millions of degrees . This gas has been heated by an inward moving shock wave that has rebounded from a collision with existing or slower moving gas. This big Q currently measures 40 light-years across and was found in our neighboring SMC galaxy . Perhaps we would know even more if we could buy a vowel .
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