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What’s A Coronal Hole?

In Sun by Brian Koberlein2 Comments

There’s news of a large coronal hole on the Sun, which just goes to show how good astronomers are at making the mundane sound terrifying. In turns out coronal holes are neither dangerous nor uncommon, but what exactly are they?

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A Darker Edge

In Sun by Brian Koberlein0 Comments

When you look at an image of the Sun, you might notice that it’s edge appears slightly dimmer than its center. This is an effect known as limb darkening, and its actually quite useful to astronomers.