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by AlienVisitor
Sun Dec 04, 2011 9:14 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Light Echoes from V838 Mon (2011 Dec 04)
Replies: 33
Views: 4239

Re: APOD: Light Echoes from V838 Mon (2011 Dec 04)

I am puzzled by the explanation for this photo. If the star became bright in 2002, and the picture was taken in 2004, shouldn't the size of the light echo ring be 4 light years (radius of 2 light years)? The picture explanation says the reflected light ring is 6 light years in diameter. This is puz...