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It is estimated to be 1000 years old. Note that the label he uses is "Spiral Nebula Messier 51." Figure 9.1: Photographic image of M51 spiral nebula by G. W. Ritchey. Credit: G. W. Ritchey, 1910, ApJ 32, Plate IV. The two sides of the argument over the spiral nebulae had to do with the size of the Milky Way and its relationship to the universe as a whole. Dark nebulae are interstellar clouds that contain a very high concentration of dust.This allows them to scatter and absorb all incident optical light, making them completely opaque at visible wavelengths.They are most obvious when located in front of a bright emission nebula (e.g. the Horsehead nebula in Orion) or in a region that is very rich in stars (e.g. Barnard 68 in Ophiuchus). In planetary science, planetary differentiation is the process of separating out different constituents of a planetary body as a consequence of their physical or chemical behavior, where the body develops into compositionally distinct layers; the denser materials of a planet sink to the center, while less dense materials rise to the surface, generally in a magma ocean.

At the center is a binary star system. It is suspected that it's apperance comes from jets of material that sprayed from the stars' equator. It is estimated to be 1000 years old. Note that the label he uses is "Spiral Nebula Messier 51." Figure 9.1: Photographic image of M51 spiral nebula by G. W. Ritchey.

The force of gravity at the surface of…. A planetary nebula is a glowing shell of gas that was once the outer layers of a star. The gas glows because the hot core's ultraviolet light ionizes the gas.

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What is a planetary nebula? the ejected envelope, often bipolar, of a red giant surrounding a stellar core remnant Quizlet Live.

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NGC 7662 is a planetary nebula located in Andromeda.It's also known as the Blue Snowball Nebula or Snowball Nebula and at apparent magnitude +8.6 is one of the brightest examples of its type and therefore a popular target for both amateur and professional astronomers. This planetary nebula is listed in the paper "Precessing Jets and Point-Symmetric Nebulae" by J.A. Cliffe et. al (1995) as having a bipolar/point symmetric symmetry. This 15" size object is immersed in a field that shows several faint stars. At this temperature, the star begins to emit large quantities of UV radiation.

A) the expanding shell of gas that is no longer gravitationally held to the remnant of a low-mass star B) the molecular cloud from which protostars form C) what is left of the planets around a star after a low-mass star has ended its life D) the expanding shell of gas that is left when a white dwarf explodes as a supernova E) a disk of gas surrounding a protostar A planetary nebula, abbreviated as PN or plural PNe, is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives. [2] The term "planetary nebula" is a misnomer because they are unrelated to planets or exoplanets .
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The ultraviolet light from the hot exposed core, called a white dwarf, causes the gases to fluoresce.

--What does it mea for the gas surrounding the white dwarf? --why we see what? --what else pushes away gas and dust--What does this mean for the ISM?--what don't form from planetary nebulae? The Ring Nebula.
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Description. A cloud of interstellar gas and dust. (Formerly) any celestial object that appears nebulous, hazy, or fuzzy, and extended in a telescope view. A ring-shaped planetary nebula is formed by an expanding shell of gas around an aging star.