Stars are formed innebulae, interstellar clouds of dust and gas (mostly hydrogen). These stellar nurseries are abundant in the arms of spiral galaxies. An accretion disk In these stellar nurseries, dense parts of these clouds undergogravitational collapseand compress to form a rotating gas globule....
2. Stars, be there millions or billions of years old, are all born in nebulae--clouds of dust and mostlyhydrogen, gas. Nebulae n.星云(nebula的复数) nebulae--clouds of dust and mostly hydrogen, gas. 星云:(官方定义)是稀薄的气体或尘埃构成的天体之一。包含了除行星和彗星外的几乎所有延展型天体。
Where stars are bornDiscusses how stars form inside tiny clusters on the galaxies. Relationship between the giant emission nebulae called H II regions and O-B associations; How to see H II regions; H II regions in galaxies...
Orion variables brighten and dim in an irregular manner, undergoing occasional eruptions in which they become significantly brighter than usual for a short time. They are often found within nebulae, like the Orion Nebula, where there are many young stars. It is believed that these eruptive stars ...
Stars are born in cold clouds of gas and dust, called nebulae, found throughout most galaxies. Nebulae’s low temperatures (about 10K or -263°C) are necessary for hydrogen gas to clump together into high enough densities to begin the process of star formation. The clump’s gravity attracts...
These luminous balls of gas helped ancient explorers navigate the seas and now help modern-day scientists navigate the universe.
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What are the corresponding steps in the text describing the process of star formation and evolution?C a. Some nebulae might become black holes. b. Stars form from rotating nebula e. c. Stars create some elements. d. New stars born after nuclear fusion. e. Supernovae spread particles for ...
Symbiotic stars have sometimes been misidentified as planetary nebulae, because their line spectra are similar to those of planetary nebulae particularly in the ultraviolet L.(Houziaux 1982 in "The Nature of Symbiotic Stars", M. Friedjung & R. Viotti eds., Reidel. p 229), while the infrared...
Planetary nebulae are not long lasting, dissipating in about 20,000 years. The white dwarf star that remains after a planetary nebula has dissipated, however, is very long lasting. It's basically a lump of carbon and oxygen mixed with electrons that are packed so tightly that they are said...