i heard that our sun is a yellow dwarf? explain true or false?

Answer 1

The Sun is a G2 star. This means that it emits most of its light in the visible range of the spectrum, with greenish yellow being slightly brighter than other colors. It is a main sequence star, meaning that it is very normal for a star of its mass. The Sun was once called a dwarf star (a yellow dwarf) (and it still is, on occasion) because it is much smaller than most visible stars in the sky. But there are vastly more smaller stars out there, stars which are too dim to see without a telescope . So the Sun is larger than the average star.

Answer 2

Yes, this is true. The actual designation is G2V. G2 is the spectral class, and indicates a star whose light output peaks in the yellow-green. Since this is, not coincidentally, the part of the spectrum our eyes are most sensitive to, we actually see the sun as white. V indicates that the sun is a main sequence star, meaning it generates energy by fusing hydrogen in its core. All main sequence stars are called dwarfs, to distinguish them from older "giant" stars. At the cool end of the sequence are the smallest stars, the red dwarfs, but even massive hot O stars are called dwarfs while they are on the main sequence. To confuse things a bit, there are also white dwarfs, which are collapsed, burned-out stars and no longer on the main sequence.

In their old age, stars evolve off the main sequence when their core hydrogen is used up. They then use a variety of other fusion reactions, including fusing helium in the core and fusing hydrogen in a shell around the helium core. These are the giant stars, so called because they swell up to enormous size.

Answer 3

True. The Sun is classified as a G2V Yellow Dwarf star.

What's to explain? It's the classification.

There are different classifications of stars according to their spectra ranging from type O, which are very hot, to M, which are so cool that molecules may form in their atmospheres. The main classifications in order of decreasing surface temperature are O, B, A, F, G, K, and M. A variety of rare spectral types have special classifications. The most common of these are types L and T, which classify the coldest low-mass stars and brown dwarfs.

Each letter has 10 sub-classifications numbered (hottest to coldest) from 0 to 9. This system matches closely with temperature, but breaks down at the extreme hottest end; class O0 and O1 stars may not exist.

In addition, stars may be classified by the luminosity effects found in their spectral lines, which correspond to their spatial size and is determined by the surface gravity. These range from 0 (hypergiants) through III (giants) to V (main sequence dwarfs) and VII (white dwarfs). Most stars belong to the main sequence, which consists of ordinary hydrogen-burning stars. These fall along a narrow band when graphed according to their absolute magnitude and spectral type. Our Sun is a main sequence G2V (yellow dwarf), being of intermediate temperature and ordinary size.

Additional nomenclature, in the form of lower-case letters, can follow the spectral type to indicate peculiar features of the spectrum. For example, an "e" can indicate the presence of emission lines; "m" represents unusually strong levels of metals, and "var" can mean variations in the spectral type.

Thanks to Wikipedia.

"Yellow dwarfs are small, main sequence stars. The Sun is a yellow dwarf. -- Thanks to Enchantedlearning.com

Answer 4

False. First is not yellow, its white. Looks yellow because the air scatters blue light (making the sky blue) and only direct yellow light reaches the surface.

Is not dwarf either. Its a large star, bigger than the average in the galaxy even if there are far larger stars out there. The thing is that small stars are not very shiny and you wont see them with your bare eyes. Not even alpha centaury, the closest star system.

Answer 5

This is partially true.

First of all our sun in currently in its 'main sequence' phase (mid-life). It has spectral classification of G2 V on the Hertzsprung-Russell diagram which is a stellar classification of stars based on their absolute magnitude, luminosity, classification, and effective temperature.

Our sun is essentially somewhere in the middle, an average star. On occasion it would be called a yellow dwarf due to its size. There are many far larger stars out there. Betelguese is a super red giant, or sirius which is a main sequence blue star. There are also far more smaller and dimmer red dwarfs so by sheer numbers our sun is brighter than about 85% of all the stars in our galaxy.

Answer 6

Our Sun is white. It is sometimes called a yellow star (spectroscopically, relative to Vega), and may appear yellow or red (viewed through the atmosphere), or appear white (viewed when too bright for the eye to see any color).

Using the Secchi Class, our Sun would fall in the category as below:

Class I: white and blue stars with broad heavy hydrogen lines and metallic lines, (modern class A)
Class II: yellow stars – hydrogen less strong, but evident metallic lines, (modern classes G and K)
Class III: orange stars with complex band spectra, (modern class M)
Class IV: red stars with significant carbon bands and lines (carbon stars),
Class V: emission lines (f.ex. Be, Bf etc).

Answer 7

That's true. Compared to other stars, ours is kind of a goldilocks star.

The Universe is full of stars, big ones, small ones,red ones, blue ones and green ones even black ones.

All stars, form vast clouds of simple gases, usually these gases are mostly hydrogen since that's 95% of everything in the universe.

What happens is that depending on how much gas falls into the gravity center of the star, tells what kind of star it's going to be.

If the star is VERY VERY BIG, something 100 times the size of our sun (which happens), then the star is kind of a rock star, live fast, die young. These stars are violent and blue and use up all their fuel in just a few million years. They are a brilliant blue because the hydrogen is SO hot! If they very big, when they "burn out" (as rock stars always do), they can become "neutron stars" , which are ultra-dense and give off alot of gamma-radiation and x-rays.

Some stars are still VERY BIG but last a bit longer, these are stars a few times larger than our sun, They are still violent and live shorter lives, but they do some cool stuff, they tend to create OTHER elements, so they have created all the carbon and oxygen and stuff in the universe which we are made of. Stars that burn oxygen burn green, stars that burn other elements are other colors.

Depending on exactly how they live their lives, these stars can both form Black stars (Black holes) , Neutron stars are like black-hole light, they still have some size, but their gravity is something we can imagine.

Black holes are different, they collapse in because of strong gravity and become basically bad-*ss stars, they cruise around and eat other stars they happen to come across.
When they eat other stars, they are messy eaters and shoot beams of high-energy gamma radiation clear across whole galaxies.

However, Our star is not like that, our star formed in a relatively small patch of our galaxy, about 4-5 billion years ago, we know this because of how much hydrogen fuel the sun appears to have used.

Our sun will not explode or become a black hole, but like all other stars, and like people, it is getting older, our sun will "live" for about 10 billion years and is a little less than 1/2 way through it's life.

Unlike the "rock-star" stars, or the "creator stars", our star will just grow old it will become more restless and put out more heat, as it starts into it's "mid-life" crisis, life on Earth will have to either adapt or it will be extinguished, and eventually it will grow to become a big, red star. Changing from the familiar yellow, eventually going to orange and then starting to grow, eventually, the sun will expand beyond the orbit of the planet Mercury and then perhaps Venus.

But because the sun is a moderate star, it's got LOTS of hydrogen left to burn, it will continue more or less as it is, for a billion or two more years.

Recently we discovered that A LOT of stars are actually much smaller than our sun, these stars are like those people who , through good living and quite lives - live to be tens of BILLIONS of years old. They are BARELY burning their hydrogen fuel at all, just sipping it - so to speak. So after our sun has turned to a small dim, white dwarf, these small, redish stars will still be cruising along, for another 10-20 BILLION years.

Answer 8

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Answer 9

Its true as it is big ball of energy and will ultimatly end up. there are certain stars which ends up in the form of Black hole and has an infintly high gravity an pulls what ever is close to it. evedence has proven that, for more detaila you can contact me ..!!

Answer 10

oh my god some say true and some say false
and even i have doubt