What is a DEEP SKY OBJECT?

Amateur astronomy uses a lot of terminology, acronyms, and jargon. I'm starting a new series called Five Minute Fridays that aims to explain just one concept per week. For this first week, I tackle DSOs. What they are, what they aren't, why it's a practical distinction, and a small aside at the end about "deep sky" vs. "deep space." #fiveminutefridays #nebulaphotos

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