You’ve probably already seen the pretty picture by now, but take a minute to try and imagine the scale. This gas cloud is 350,000 light-years across, and the particles that make it up are a scalding 7.5 million degrees Celsius. This incredibly diffuse yet energetic gas has a mass of 10 billion suns, but a cubic foot in this space has an average density of just two or three particles in it. Yup, it’s HUGE."
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