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Which scientist proved that the stars with mass less than 1.44 times the mass of the sun end up as white dwarfs?
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∙ 11y ago
S. Chandrasekhar
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∙ 11y ago
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How many times has cheryl burk won dancing with the stars?
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What is the mass of the lowest-mass stars?
From Wikipedia: "For stars with similar metallicity to the Sun, the theoretical minimum mass the star can have, and still undergo fusion at the core, is estimated to be about 75 times the mass of Jupiter. When the metallicity is very low, however, a recent study of the faintest stars found that the minimum star size seems to be about 8.3% of the solar mass, or about 87 times the mass of Jupiter. Smaller bodies are called brown dwarfs, which occupy a poorly defined grey area between stars and gas giants." Comment 1: Metallicity refers to the percentage of elements heavier than helium (not "metals" in the chemical sense). Comment 2: Basically, a brown dwarf gets hot enough to fuse deuterium (hydrogen-2), but not regular hydrogen (hydrogen-1), which severely limits the amount of energy it can produce.
How many star systems are within 50 light years of Sol?
That is not known exactly, since even at such a relatively short distance, many red dwarves will go undetected. You can check the Wikipedia article "List of nearest stars and brown dwarfs" for known stars up to a distance of about 16 light-years, and extrapolate. That is, just assume that a larger volume has proportionally more stars. Note that due to the difficulty of detecting red dwarves, this should give you a MORE RELIABLE figure than actually counting all the known stars up to a distance of 50 light-years (since it is likely that up to a distance of 16 light-years, the detection rate for red dwarves is higher). As a reminder, the volume of a sphere is proportional to the cube of its radius. That is, a sphere of 50 light-years has approximately 29 times as much volume as one of radius 16.3 light-years, so you would expect it to have approximately 29 times as many stars.
Could an average stars such as our sun become a neutron star?
No. Stars such as our sun become white dwarfs. Only stars 8-10 times the mass of the sun or more become neutron stars.
Is a red star smaller than a regular star?
It depends, as there are two general classes of red star. Red dwarfs are low-mass stars and smallest of all main sequence stars. Red giants and supergiants are old dying stars that are many times larger than other stars.
Can colliding red dwarf star save the universe one quadrillion years from present times?
No. Two colliding red dwarfs will merely result in a new star with the combined mass of the two original stars. The merging of two stars would be utterly insignificant on the scale of the whole universe.
How different can one star be from another?
Radically different. As different as night and day. A neutron star may be a cold dark core of neutronium engulfed by a thin layer of degenerate matter, packed into a tiny sphere 20 miles in diameter. A star like our sun is 800,000 miles in diameter. Stars can be much, much, MUCH larger than that. Deneb is 200 to 300 times larger than our sun, and shines thousands of times brighter, so that it is quite visible from 1400 light years away. But even Deneb is dwarfed by some stars. Stars can range from small red dwarfs to big super giants, white dwarfs, or collapsed stars like tiny rapidly spinning pulsars and quark stars.
Are main sequence stars all alike in their luminosity and temperature?
No. Main sequence stars vary greatly in both temperature and luminosity. The least massive stars, red dwarfs, can have temperatures as low as 2,300 Kelvin and luminosity as low as 0.015% that of the sun. The most massive stars, which are blue in color can have temperatures as high as 50,000 Kelvin and may be hundreds of thousands times more luminous than the sun.
Why do stars that are thousands of times larger to your sun is called super giant star?
Early attempts to classify the stars led some astronomers to split them into "Reisen" and "Zwergen," German words for "Giants" and "Dwarfs," these being large and small creatures of mythology. Later observations uncovered more sizes and these were named "subgiants," "bright giants," "supergiants" and "hypergiants." Modern astronomy reveals that most stars are dwarfs. The Sun, incidentally, was original designated a dwarf star because it was significantly smaller that the giants and there was no "regular" size category. However, the Sun is, in fact, larger than 80% of all stars and is more properly referred to as a "Main Sequence" star. Interestingly, allow the sizes of stars vary so greatly, their masses vary much less. Giants tend to be very "thin" stars, the very biggest being hardly as dense as Earth's upper atmosphere, while dwarfs can be amazingly dense.
How is it possible for white dwarfs of have a lower luminosity than the sun even though the sun is much cooler than the white dwarfs?
Because luminosity is a measure of brightness over distance. Also white dwarfs are a hundred times smaller than the Sun. Most white dwarfs are a long way away and thus are difficult to see.
Why is the fate of all-star?
Your question is not very clear, so i will answer according to my understanding. There are different types of stars, all different in size and composition. Regardsless of this fact, one commonality exist between all stars, eventually they run out of fuel. Super massive stars are the largest in the universe and they consume their fuel very quickly after which they will detonate as supernovae; completely disintegrating themselves in the process. The longest living stars are Red Dwarfs. Red dwarf stars are the most common kind of stars in the Universe. These are main sequence stars but they have such low mass that they're much cooler than stars like our Sun. They have another advantage. Red dwarf stars are able to keep the hydrogen fuel mixing into their core, and so they can conserve their fuel for much longer than other stars. Astronomers estimate that some red dwarf stars will burn for up to 10 trillion years. The smallest red dwarfs are 0.075 times the mass of the Sun, and they can have a mass of up to half of the Sun.
What determines how a star ends its life?
The mass of a star determines how it ends its life cycle. Less massive stars become white dwarfs, shedding their outer layers as glowing shells of ionized gas (planetary nebulae). Stars 10+ times more massive than the Sun can be rendered as supernovae, as their cores collapse into black holes.
What are the sizes of different stars?
Size of Stars Stars differ in size. Some stars have diameters of only 20 km. These stars are very much smaller than the earth. Our sun is just a medium-sized star. Many stars are much larger than the sun. Astronomers classify according to size. Supergiants are the largest known stars. The star Antares has a diameter 330 times that of the sun. The sun has a diameter of 1 392 000 km. Some supergiants have diameters about 1000 times of the sun. Giants are stars with diameters from 10 to 100 times that of the sun. The star Aldebaran is a giant with a diameter about 45 times that of the sun. Medium-sized stars are about the size of the sun. Their diameters range from 139 200 km to 13 920 000 km. Sirius is a medium-sized star. White dwarfs are small stars with diameters of less than 10 000 km. The smallest white dwarf is Van Maanen's star with a diameter of 8370 km.
What can the temperature of a star tell us?
The temperature of a star can tell us how big or small the star is. We can also determine it's distance from earth and how old the star is and how bright the star is. The hotter the star the shorter it's life is. The hottest star in the universe is called a super hot blue giant and only have a life of a few million years as they burn their fuel quicker then any other star. At the end of this stars life it will go supernova. Then there are red giants they are 20 times massive and 16000 times brighter then our sun also at the end if this stars life it to will go supernova. Then there are yellow dwarf stars like our sun, this type of star has a life span of approx. 10 billion years. At the moment our sun is middle age at over 4.5 billion years old. Yellow dwarfs burn out at the end of there life and don't go supernova as they don't have a huge mass. Then there are red dwarfs which are the most common stars in the universe. Red dwarfs burn cooler and are very fain. this type of star has the longest life and will be the last stars to die in trillions and trillions of years.
What is the opposite of dwarf?
In astronomy, stars are divided mainly into two categories, "dwarfs" and "giants". There are some specialized categories ("bright giants", "hypergiants") but overall ... giants is a pretty good answer.(Even dwarf stars can still be pretty big, our own Sun, with about a million times the volume of Earth, is considered a dwarf.)
