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One of the most notable aspects of the nebulae is their variety of shapes and structures.
Thanks to modern telescopes and the use of computers, detailed digital photos have been developed that, by means of the appropriate computer programs, can be colored to obtain spectacular images.
Planetary nebulae look a lot like planets when viewed through a telescope. In reality, they are layers of material detached from an evolved star of medium mass, which releases from red giant to white dwarf.
The Ring nebula, in the constellation Lira, is a typical planetarium that has a rotation period of 132,900 years and a mass of about 14 times the mass of the Sun. In the Milky Way several thousand planetariums have been discovered.
More spectacular, but smaller in number, are the remnants of supernovae, whose most significant representative is the Crab Nebula, in Taurus, which fades at a rate of 0.4% per year. Nebulae of this type are intense radio sources, due to the explosions that formed them and the remains of pulsars into which the stars became.
Herbig-Haro objects (HH objects)
Herbig-Haro objects, which owe their name to Mexican astronomer Guillermo Haro and American George Herbig, are very bright little nebulas that are found within very dense interstellar clouds
They are probably the product of gas jets expelled by stars in the process of formation. Molecular clouds are, for their part, extremely large, with a width of many light years, with an undefined profile and a faint and foggy appearance.
Herbig-Haro objects can be studied in the infrared. These objects vary in size and brightness in a few years. They are found in regions of the Universe that have active star formation.
It is believed that these nebulae correspond to high velocity gas flows, ejected by young stars when crashing into interstellar clouds. The study of Herbig-Haro's objects helps to understand the details of how the stars of the Universe are formed.
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