The final expulsion of gas by a star as it forms a planetary nebula --- the ionized shell of gas often observed surrounding a young white dwarf --- is one of the most poorly understood stages of stellar evolution. Such nebulae form extremely rapidly (about 100 years for the ionization) ...
A planetary nebula is an expanding cloud of gas ejected from a star that is nearing the end of its life. 行星状星云一个由来自中心濒临死亡恒星所释放出的气体组成的正在膨胀的星云。 cdn.astronomy.com.cn 8. Officially known as PN G75. 5+1. 7, the Soap Bubble is an example of a planetar...
An Emissions Nebula produces its light, whereas a Reflection Nebula glows because of light from a source outside the Nebula. Solar System Nebula Theory It is theorized that theSolar Systemwas created from a nebula billions of years ago. TheUniverseis 13.8 billion years old, and the generally ...
NGC 2438 is a planetary nebula, formed after the death of a Sun-like star. The medium-sized star would have expelled its outer layers of gas into space as it died, leaving behind a white-dwarf core. A halo of glowing gas over 4.5 light-years across surrounds the nebula’s brighter inn...
Another type of diffuse nebula, a reflection nebula doesn’t emit its own light, but scatters light from embedded stars. (Image credit: NASA, JPL-Caltech, Kate Su (Steward Obs, U. Arizona) et al.) Planetary nebula: The Helix Nebula This is composed of expanding gas that was blown off...
The PuWe 1 Planetary Nebula PuWe 1 is one of the most difficult-to-image planetary nebulae. Its apparent size is comparable to the size of the full Moon and its gaseous material is far away from the progenitor star, so it glows very faintly. This picture is the result of 112 hours ...
Mueller, Pluto's structure and composition suggest origin in the solar, not a planetary, nebula. Nature 335, 240-243 (1988)Mckinnon W B,Mueller S.Pluto's structure and compositionsuggest origin in the solar,not a planetary,nebula[J].Nature,1988,335:240～243,...
periodic table. When fusing gets to Iron, it cannot transform anymore and, as such, dies, first growing into a supergiant and then becoming aPlanetary Nebulaor if it was massive enough gosupernova, leaving behind a supernova remnant likeCrab Nebula. Our Sun will become a planetary nebula. ...
Betelgeuse is profusely losing mass due to a powerful solar wind and there will be shells of gas and dust moving away from the star similar to a planetary nebula, but there is no super hot remnant white dwarf or neutron star present in the center to light it up. So we don’t see ...
Portrait of M1-63, a beautiful example of a bipolar planetary nebula located in the constellation of Scutum, captured by the Hubble Space Telescope. Credit: ESA/Hubble & NASA, L. Stanghellini This week’s NASA/ESA Hubble Space Telescope Picture of the Week features an impressive portrait of...