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Update to Comet ISON

เขียนโดย fahummeenudmin
Recently, we have seen some changes in the brightness of Comet ISON. Notice how the magnitude (a measure of the brightness) has gone from around 10 at the end of October to near 4 now. For the everyday person, that means that ISON has become around 200 times brighter in a matter of weeks and has been visible to the naked eye in many locations. Magnitude 6 is the general threshold for visibility to the naked eye. The smaller the magnitude number, the brighter an object is. For example, the Full Moon has a magnitude of about -12, and Venus, a bright "star," is around -4.

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