planetary nebula size

According to the Skalnate Pleso Catalogue (1951) the distance of NGC 7662 is about 1,800 light years, the actual diameter about 20,000 AU. (Image credit: European Southern Observatory) The term "planetary nebula" is a misnomer. Compared with diffuse nebulae (see H II region), planetary nebulae are small objects, having a radius typically of 1 light-year and containing a mass of gas of about 0.3 solar mass. For a typical planetary nebula, its radius is of order 1 light year, or 9.5 x 10 12 km. Carina Nebula: … NGC 7662 (also known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22) is a planetary nebula located in the constellation Andromeda.. The nebula disk has an angular size of 1.5 × 1 arcminutes, making it too small to be resolved with 10×50 binoculars. So 9.5 x 10 12 km / 25 km/sec = 3.8 x 10 11 seconds, which is approximately 12,000 years. Nebula surrounding VY Canis Majoris, which is one of largest known stars. The distance to this nebula is not known with any real accuracy. The largest planetaries have ages determined in this way to be less than 50,000 years. The Dumbbell Nebula (M27) was the first planetary nebula discovered, by Charles Messier in 1764. It is best observed using a telescope with an aperture of at least 20 cm (8 in), but even a 7.5 cm (3 in) telescope will reveal its elliptical ring shape. When a star like the sun uses up all of the hydrogen in its core, it expands into a red giant, with a radius that increases by tens to hundreds of times. A planetary nebula represents a phase of stellar evolution that the sun should experience several billion years from now.

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