Welche neuen süßen Bilder gibt es aus den Familien der Stars? Was hat der Lieblingsschauspieler im Interview gesagt? Wer über News, Partys und das Leben. Neuigkeiten aus der Welt der Stars und VIPs: Aktuelle Stories und die Top-News deiner Promis bei waterloobowlsblackpool.com Ein Star [ˈstaːr] oder auch [ ˈʃtaːr], alternativ [ -ʀ] oder [ -ʁ] (von englisch star, „Stern“) ist eine prominente Persönlichkeit mit überragenden Leistungen auf.
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And there are billions of galaxies in the universe. So far, we have learned that hundreds also have planets orbiting them.
Since the dawn of recorded civilization, stars played a key role in religion and proved vital to navigation. Astronomy , the study of the heavens, may be the most ancient of the sciences.
The invention of the telescope and the discovery of the laws of motion and gravity in the 17th century prompted the realization that stars were just like the sun, all obeying the same laws of physics.
In the 19th century, photography and spectroscopy — the study of the wavelengths of light that objects emit — made it possible to investigate the compositions and motions of stars from afar, leading to the development of astrophysics.
In , the first radio telescope was built, enabling astronomers to detect otherwise invisible radiation from stars. The first gamma-ray telescope launched in , pioneering the study of star explosions supernovae.
Also in the s, astronomers commenced infrared observations using balloon-borne telescopes, gathering information about stars and other objects based on their heat emissions; the first infrared telescope the Infrared Astronomical Satellite launched in Microwave emissions are generally used to probe the young universe's origins, but they are occasionally used to study stars.
In , the first space-based optical telescope, the Hubble Space Telescope , was launched, providing the deepest, most detailed visible-light view of the universe.
There have been, of course, more advanced observatories in all wavelengths over the years, and even more powerful ones are planned.
A couple of examples are the European Extremely Large Telescope E-ELT , which is planned to start observations in in infrared and optical wavelengths.
Ancient cultures saw patterns in the heavens that resembled people, animals or common objects — constellations that came to represent figures from myth, such as Orion the Hunter, a hero in Greek mythology.
Astronomers now often use constellations in the naming of stars. The International Astronomical Union, the world authority for assigning names to celestial objects, officially recognizes 88 constellations.
Usually, the brightest star in a constellation has "alpha," the first letter of the Greek alphabet, as part of its scientific name.
The second brightest star in a constellation is typically designated "beta," the third brightest "gamma," and so on until all the Greek letters are used, after which numerical designations follow.
A number of stars have possessed names since antiquity — Betelgeuse , for instance, means "the hand or the armpit of the giant" in Arabic.
It is the brightest star in Orion, and its scientific name is Alpha Orionis. Also, different astronomers over the years have compiled star catalogs that use unique numbering systems.
The Henry Draper Catalog, named after a pioneer in astrophotography, provides spectral classification and rough positions for , stars and has been widely used of by the astronomical community for over half a century.
The catalog designates Betelgeuse as HD Since there are so many stars in the universe, the IAU uses a different system for newfound stars.
Most consist of an abbreviation that stands for either the type of star or a catalog that lists information about the star, followed by a group of symbols.
The J reveals that a coordinate system known as J is being used, while the and are coordinates similar to the latitude and longitude codes used on Earth.
In recent years, the IAU formalized several names for stars amid calls from the astronomical community to include the public in their naming process.
The IAU formalized 14 star names in the "Name ExoWorlds" contest , taking suggestions from science and astronomy clubs around the world. Then in , the IAU approved star names , mostly taking cues from antiquity in making its decision.
The goal was to reduce variations in star names and also spelling "Formalhaut", for example, had 30 recorded variations. However, the long-standing name "Alpha Centauri" — referring to a famous star system with planets just four light years from Earth — was replaced with Rigel Kentaurus.
A star develops from a giant, slowly rotating cloud that is made up entirely or almost entirely of hydrogen and helium. Due to its own gravitational pull, the cloud behind to collapse inward, and as it shrinks, it spins more and more quickly, with the outer parts becoming a disk while the innermost parts become a roughly spherical clump.
According to NASA, this collapsing material grows hotter and denser, forming a ball-shaped protostar. When the heat and pressure in the protostar reaches about 1.
Nuclear fusion converts a small amount of the mass of these atoms into extraordinary amounts of energy — for instance, 1 gram of mass converted entirely to energy would be equal to an explosion of roughly 22, tons of TNT.
The life cycles of stars follow patterns based mostly on their initial mass. These include intermediate-mass stars such as the sun, with half to eight times the mass of the sun, high-mass stars that are more than eight solar masses, and low-mass stars a tenth to half a solar mass in size.
The greater a star's mass, the shorter its lifespan generally is. Objects smaller than a tenth of a solar mass do not have enough gravitational pull to ignite nuclear fusion — some might become failed stars known as brown dwarfs.
An intermediate-mass star begins with a cloud that takes about , years to collapse into a protostar with a surface temperature of about 6, F 3, C.
After hydrogen fusion starts, the result is a T-Tauri star , a variable star that fluctuates in brightness. This star continues to collapse for roughly 10 million years until its expansion due to energy generated by nuclear fusion is balanced by its contraction from gravity, after which point it becomes a main-sequence star that gets all its energy from hydrogen fusion in its core.
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How does Facebook protect my privacy when I spend money? Astrophysics Fleet Mission Chart. Spacecraft Paper Models. Related Content Mysteries of the Sun.
Death of Stars video. Life Cycles of Stars. More About Stars. Stellar Evolution. Recommended Articles. July 14, Remembering Riccardo Giacconi, X-Ray December 11, Hubble Captures the Galaxy's July 03, April 10, Ask a Question.
Average Stars Become White Dwarfs For average stars like the Sun, the process of ejecting its outer layers continues until the stellar core is exposed.
This dead, but still ferociously hot stellar cinder is called a White Dwarf. White dwarfs, which are roughly the size of our Earth despite containing the mass of a star, once puzzled astronomers - why didn't they collapse further?
What force supported the mass of the core? Quantum mechanics provided the explanation. Pressure from fast moving electrons keeps these stars from collapsing.
The more massive the core, the denser the white dwarf that is formed. Thus, the smaller a white dwarf is in diameter, the larger it is in mass!
These paradoxical stars are very common - our own Sun will be a white dwarf billions of years from now. White dwarfs are intrinsically very faint because they are so small and, lacking a source of energy production, they fade into oblivion as they gradually cool down.
This fate awaits only those stars with a mass up to about 1. Above that mass, electron pressure cannot support the core against further collapse.
Such stars suffer a different fate as described below. White Dwarfs May Become Novae If a white dwarf forms in a binary or multiple star system, it may experience a more eventful demise as a nova.
Nova is Latin for "new" - novae were once thought to be new stars. Today, we understand that they are in fact, very old stars - white dwarfs.
If a white dwarf is close enough to a companion star, its gravity may drag matter - mostly hydrogen - from the outer layers of that star onto itself, building up its surface layer.
When enough hydrogen has accumulated on the surface, a burst of nuclear fusion occurs, causing the white dwarf to brighten substantially and expel the remaining material.
Within a few days, the glow subsides and the cycle starts again. Sometimes, particularly massive white dwarfs those near the 1. Supernovae Leave Behind Neutron Stars or Black Holes Main sequence stars over eight solar masses are destined to die in a titanic explosion called a supernova.
A supernova is not merely a bigger nova.