bipolar planetary nebula
What is a planetary nebula?
1) bipolar jets ejected by the variable "T Tauri 2) a planet surrounded by a bright layer of gas 3) the envelope expelled, often bipolar, a giant red surrounding a stellar core remnant 4) a type of young star, the average mass 5), the gas disk and dust surrounding a young star who will soon be a solar system
Planetary nebulae, or worldwide, so called because many of them seem superficially planets through telescopes. They are actually shells of material that an old average star sheds during a late stage in its evolution red giant, before becoming a white dwarf. The Ring Nebula in the constellation Lyra, a typical planet has a rotation period of 132,900 years and a mass estimated at about 14 times higher than the sun from the earth. Several thousand planets have been discovered in the Milky Way. More spectacular but fewer in number are nebulas, which are the fragments of supernova explosions, perhaps the most famous of which is the Crab Nebula, in Taurus, are disappearing at a rate of about 0.4 percent. Such nebulae are strong emitters of radio waves as a result of the explosions that formed them and the probable pulsar remnants of the original star.
Mz 3 Menzel 3 Bipolar Planetary Nebula, zoom sequence
