What is a superluminous supernova?
Daniel and Kelly’s Extraordinary Universe
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The Importance of Ancient Astronomical Records
We haven't seen one from our own galaxy in 400 years. How does it Kepler know it was within our galaxy? Well, he didn't really understand the idea of galaxies. But we can now look at the thing he was studying and we understand what he was looking at. And we know that it's in our galaxy.
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