The ring nebula is a planetary nebula in the constellation Lyra. It has an angular size of 1.4 arcmin X 1.0 ar?

the ring nebula is a planetary nebula in the constellation Lyra. It has an angular size of 1.4 arcmin X 1.0 arcmin and is expanding at the rate of about 20 km/s. Approximately how long ago did the central star shed its outer layers? assume that the nebula is 2,700 ly from earth.The ring nebula is a planetary nebula in the constellation Lyra. It has an angular size of 1.4 arcmin X 1.0 ar?Actual size (km) = 150,000,000 x distance(pc) x angular diameter(arc seconds)



2,700 ly = 827.805367 parsecs

1.4 arc minutes = 84 arc seconds

1 arc minutes = 60 arc seconds



Actual Size = 150,000,000 x 827.805367 x 84

Actual Size = 1.04303476 脳 10^13 km



Actual Size = 150,000,000 x 827.805367 x 60

Actual Size = 7.4502483 脳 10^12 km



Dimensions: 1.1 light years x .787 light years





Age = Diameter/rate of expansion

Age = (1.04303476 脳 10^13)/20

Age = 521,517,380,000 seconds = 16,526.24 years