Different Types Of Stars. - Science/Technology - Nairaland
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| Different Types Of Stars. by ValentineMary(m): 7:25am On Mar 22, 2016 |
There are several different main types of stars ,
depending on their size, luminosity and lifespan: brown dwarfs - "failed stars ", which form from clouds of interstellar gas , as other stars do, but never reach sufficient mass , density and internal heat to start the nuclear fusion process (i.e. less than 8% of the mass of our Sun). Although they may glow dimly when newly formed (and are therefore in fact red not brown), they start to cool soon after and so are very difficult to spot. They may actually be among the most common type of stars. red dwarfs - small and relatively cool stars , bigger than brown dwarfs, but less than 40 - 50% of the mass of our Sun. Most of the stars in our galaxy (excluding possible unseen brown dwarfs) are red dwarfs. They are much dimmer than our Sun (even the largest red dwarf has only about 10% of the Sun's luminosity), burn much more slowly, and typically live much longer. yellow dwarfs - main-sequence stars like our own Sun, Alpha Centauri A, Tau Ceti, etc, typically about 80 - 100% of the size of the Sun, and actually more white than yellow. They are also known as G V stars for their spectral type G and luminosity class V. white stars - bright, main-sequence stars with masses from 1.4 to 2.1 times the mass of the Sun and surface temperatures between 7,600°C and 10,000°C, such as Sirius A and Vega. red giants - luminous giant stars of low or intermediate mass (usually between 0.5 and 10 solar masses) in a late phase of stellar evolution, such as Aldeberan and Arcturus. When a main- sequence star has fused all its hydrogen into helium, it then starts to burn its helium to produce carbon and oxygen, and expands to many times its previous volume to become a red giant. After a relatively short time (in the region of two hundred million years), the red giant puffs out its outer layers in a gas cloud called a nebula and collapses in on itself to form a white dwarf. The largest red giants are known as red supergiants, and are the largest stars in the universe in terms of volume (well-known examples are Antares and Betelgeuse). white dwarfs - small, dense, burnt-out husks of stars, no longer undergoing fusion reactions, and representing the final evolutionary state of most of the stars in our galaxy. When a red giant has used up its helium to produce carbon and oxygen, and has insufficient mass to generate the core temperatures required to fuse carbon, it sheds its outer layers to form a planetary nebula, and leaves behind an inert mass of carbon and oxygen. A white dwarf is typically only the size of the Earth, but 200,000 times more dense. black dwarfs - hypothetical stellar remnants created when a white dwarf becomes cool and dark after about ten billion years of life. Black dwarfs are very hard to detect, and very few would exist yet anyway in a universe only 13.7 billion years old. blue giants - bright, giant stars , between 10 and 100 times the size of the Sun, and between 10 and 1,000 times its luminosity. Because of their mass and hotness, they are relatively short-lived and quickly exhaust their hydrogen fuel, ending as red supergiants or neutron stars . The biggest and most luminous stars are referred to as blue supergiants and hypergiants. The best known blue supergiant is Rigel, the brightest star in the constellation of Orion, which has a mass about 20 times that of the Sun and a luminosity more than 60,000 times greater. The biggest and brightest ever found is 10 million times as bright as the Sun. neutron stars - stellar remnants that can result from the gravitational collapse of massive stars during a supernova event. They are composed almost entirely of crushed neutrons , and are very hot and very dense. Although a typical neutron star has a mass of only between 1.35 and about 2.1 times that of our Sun, it is 60,000 times smaller than the Sun (usually in the region of just 20 - 30 kilometres across) and, because of this huge density , has a gravity of over 200 billion times that we experience on Earth. They rotate very fast (especially soon after the supernova explosion) and some emit regular pulses of radiation and are known as pulsars . Smaller collapsed stars will usually become white dwarfs, and larger ones (over about 5 solar masses) will collapse completely into a black hole singularity. variable stars - stars that grow and shrink in size periodically and appear to pulsate. The changes in apparent brightness may be due to variations in the star 's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth. binary stars - two stars in close proximity which orbit around their common centre of mass . In fact, the majority of stars are part of binary, triplet or multiple star systems, and well-known examples are Sirius in the Canis Major constellation and Alpha Centauri. 3 Likes |
| Re: Different Types Of Stars. by johnydon22(m): 2:28pm On Mar 22, 2016 |
Nice one ValentineMary please you can add pictures too to make it more fun!!!  6 Likes 1 Share |
| Re: Different Types Of Stars. by KENZYYONG(m): 3:22pm On Mar 22, 2016 |
Pictures always play a very important role on posts here...#thumbs up bro 4 Likes |
| Re: Different Types Of Stars. by Nobody: 5:06pm On Mar 22, 2016 |
who can tell me what kind of star Polaris is? |
| Re: Different Types Of Stars. by samsard(m): 9:35pm On Mar 22, 2016 |
The Sun is already so bright i can't look at it from the earth with my naked eyes, yet am being told there is a star 10,000,000 times brighter than our Sun!! What is that kind of light suppose to look like? @ValentineMary @Teempakguy n @Johnydon22 |
| Re: Different Types Of Stars. by johnydon22(m): 9:42pm On Mar 22, 2016 |
samsard: If such stars are close to the earth as the sun, you wouldn't live to look at it.. That's how bright they are !!! |
| Re: Different Types Of Stars. by Nobody: 9:44pm On Mar 22, 2016 |
samsard:Look? man, forget look. think DEATH. That kind of brightness can only be quantified mathematically with the notion of intensity. you cannot experience it. if you ever get exposed to such light, instant death will ensue. that kind of light will penetrate your eyelids burn them off, burn your eyes off, burn off your skin, and . . . if there is oxygen around, it will oxidize your bones. right after evaporating all your body hair. man, forget look. Think do NOT attempt to venture near anything with that amount of intensity.  9 Likes |
| Re: Different Types Of Stars. by Afrobasic(m): 11:24pm On Mar 23, 2016 |
A good read. Nice thread. |
| Re: Different Types Of Stars. by Blakjewelry(m): 7:42pm On Mar 24, 2016 |
samsard:Simply put such star will take up much of the solar system even up to were Jupiter is, in other words there will be no earth. |
| Re: Different Types Of Stars. by boman2014: 12:01am On Mar 25, 2016 |
nice info |
| Re: Different Types Of Stars. by MadCow1: 9:40am On Mar 27, 2016 |
Different types of Stars I know.. 1. Cold Filter. 2. Triple X 3. Radler. 10 Likes |
| Re: Different Types Of Stars. by lonelydora: 9:40am On Mar 27, 2016 |
Meaning 90% of stars are dwarfs? |
| Re: Different Types Of Stars. by Gracito(f): 9:41am On Mar 27, 2016 |
Awesome thread. Following... |
| Re: Different Types Of Stars. by Nobody: 9:41am On Mar 27, 2016 |
Pinsure or adonbilivit 1 Like |
| Re: Different Types Of Stars. by Nobody: 9:42am On Mar 27, 2016 |
nice one |
| Re: Different Types Of Stars. by omenka(m): 9:43am On Mar 27, 2016 |
Why I like Explorers, he gives it to you with rare pictures. Not that I don't appreciate the op though. 1 Like |
| Re: Different Types Of Stars. by Beremx(f): 9:43am On Mar 27, 2016 |
No pictures eh kwa? next topic please! 1 Like |
| Re: Different Types Of Stars. by InyinyaAgbaOku(m): 9:44am On Mar 27, 2016 |
Teempakguy:You sound like an adult trying to scare kids. Take it easy |
| Re: Different Types Of Stars. by Nobody: 9:44am On Mar 27, 2016 |
Teempakguy: Yellow super giant, apparently OP forgot that one |
| Re: Different Types Of Stars. by petkoffdrake2(m): 9:45am On Mar 27, 2016 |
NP pix? I don't belevit !  |
| Re: Different Types Of Stars. by laksides: 9:45am On Mar 27, 2016 |
mine is ultimate star  |
| Re: Different Types Of Stars. by Nobody: 9:45am On Mar 27, 2016 |
Are you serious? |
| Re: Different Types Of Stars. by macino1(m): 9:46am On Mar 27, 2016 |
Thanks Informative |
| Re: Different Types Of Stars. by Nobody: 9:47am On Mar 27, 2016 |
InyinyaAgbaOku: Lol, take that fear and multiply it by 100 Thats how scary it is. |
| Re: Different Types Of Stars. by haywire07(m): 9:47am On Mar 27, 2016 |
So wat ?  Is d star fr sale? |
| Re: Different Types Of Stars. by 4nobody4every1: 9:47am On Mar 27, 2016 |
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| Re: Different Types Of Stars. by taurus25(m): 9:48am On Mar 27, 2016 |
brown dwarfs red dwarfs yellow dwarfs white dwarfs
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| Re: Different Types Of Stars. by JaypeeAnics(m): 9:49am On Mar 27, 2016 |
And the only way u can see all dis stars at once is when a military man slaps u. 9 Likes |
| Re: Different Types Of Stars. by KOLZY(m): 9:49am On Mar 27, 2016 |
No Pisure? |
| Re: Different Types Of Stars. by Nobody: 9:49am On Mar 27, 2016 |
You forgot to add Brandnew star.  |
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