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Title: The Ring nebula is a planetary nebula with an angular diameter of 72 secondes of arc and a distance of 5000 ly? Post by: microlipse on Nov 10, 2012 What is its linear diameter? in lightyears What is this in kilometers? If the Ring nebula is expanding at a velocity of 15 km/s, typical of planetary nebulae, how old is it? yrs (Hint: 1 year is 3.15e7 s)
Title: The Ring nebula is a planetary nebula with an angular diameter of 72 secondes of arc and a distance of 5000 ly? Post by: ilovebio on Nov 10, 2012 Content hidden
Title: The Ring nebula is a planetary nebula with an angular diameter of 72 secondes of arc and a distance of 5000 ly? Post by: Rjune1 on Nov 10, 2012 Linear Diameter(kilometers) = 150,000,000 x distance(in parsecs) x angular diameter(arc seconds)
5,000 ly= 1,532.97 parsecs linear diameter = 150,000,000 x 1,532.97 x 72 Linear diameter = 1.6556076 × 10^13 km OR 1.75 light years ------------------------------------------------ 15 km/s = .00005 c 1.75/.00005 = 35,000 years <---- age of nebula |