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Proper Motions. Proper Motion is the apparent angular motion of a star across the sky with respect to more distant stars. Typical proper motion is ~0.1 arcsec/year. Largest: 10.25 arcsec/yr (Barnard's Star). This is the projection onto the sky of the star's true motions through space relative to the Sun.
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This movie shows the appearance of the Big Dipper (Ursa...
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The sudden burst of light made by a new star blows away much of the nearby gas cloud. However, it can leave enough material behind to form a number of planets. After stellar ignition, the star becomes relatively stable. All the energy in a star is made in its centre (its core), by a process called nuclear fusion. The star releases the energy as ...
Apr 1, 2024 · Galaxies like ours comprise both stars and interstellar gas (also called the interstellar medium, or ISM). The Milky Way, for example, holds more than 100 billion stars and about 10 billion times ...
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Mar 1, 2024 · The Orion Nebula is an active star-forming region that's part of the much larger Orion A molecular cloud. At only 1,400 light-years away, it is the closest stellar nursery where high-mass stars ...
- Nia Imara
Stars form in large clouds of gas and dust called molecular clouds. Molecular clouds range from 1,000 to 10 million times the mass of the Sun and can span as much as hundreds of light-years. Molecular clouds are cold which causes gas to clump, creating high-density pockets. Some of these clumps can collide with each other or collect more matter ...
The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding galaxy. [143] The components of motion of a star consist of the radial velocity toward or away from the Sun, and the traverse angular movement, which is called its proper motion. [144]
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2 days ago · Since nearly all stars more massive than the Sun eventually evolve into such cool stars, their winds, pouring into space from vast numbers of stars, provide a major source of new gas and dust in interstellar space, thereby furnishing a vital link in the cycle of star formation and galactic evolution. As in the case of the hot stars, the specific mechanism that drives the winds of the cool ...
