Sunday, February 13, 2011

APOD 3.4

Hey guys, look! It's Orion! No, really, it is. You don't believe me, do you? Well, allow me to explain. This is a "step-focus" image that allows us to determine the heat, and therefore the class, of stars. If you look at the center of each "bow-tie", then you can connect those dots to reform the familiar constellation of Orion.

A step-trace photograph of Orion

The most notable stars within this photo are the top-left and the bottom-right. These stars are respectively Betelgeuse and Rigel. Betelgeuse has a more orange hue to it because it is the only star in the constellation to be classified as a red giant star, with temperatures of 3000 Kelvin, where as Rigel is a blue super-giant, with temperatures of 30,000 Kelvin.

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