The new measurement of HR A shows they can be much bigger. HR A is 50 per cent larger than the red hypergiant Betelgeuse , which is located in the constellation Orion and is the ninth brightest star in the night sky. Previous observations suggested the star varied in brightness.
Now the team has shown that this is due to a companion star that is around one third its size. It is , miles 1,, km in diameter, which makes it times wider than Earth. It's 10, degrees Fahrenheit 5, degrees Celsius at the surface, and 27 million degrees Fahrenheit 15,, degrees Celsius in the core. Our Sun is pretty impressive, but how does it compare to other stars? There are billions more stars in the Milky Way galaxy - the galaxy we call home.
And there are many, many more in the rest of the universe. Is our Sun special? It turns out that our Sun is an average sized star. There are bigger stars, and there are smaller stars. Earth, for comparison, has a radius of only 2. All the planets in our Solar System combined account for just 0. Earth, for example, is To put that into perspective, the mass of Earth is equivalent to 5. But how do the other stars fare?
The most giant planet in our Solar System, namely Jupiter , has a diameter of around It has a mean radius of You could fit 1. Now that may seem impressive at first glance; however, consider this. Mercury has a diameter of only 4. It would take around more than With that being said, what is bigger than our Sun? The Sun may seem incredibly big, but there are billions of things in the Universe, which are bigger than our Sun. Consider this; our Sun is considered an averaged sized star in the best-case scenario.
There are enormous stars out there which are hundreds to thousands of times bigger than our Sun. I believe you have it wrong. We have a very good understanding about the world around us and universe and there is still a lot to learn about them. Einstein's theory about the speed of light being the ultimate speed in universe is still valid until otherwise proven wrong. I read about the sub-particles traveling faster than the speed of light but the experiment have to be repeated to make sure the results are real.
There is an extremely small margin of error here. You are talking about 10 nanoseconds. This is an extremely brief period of time. One nanosecond is 1 billionth of a second. It is possible they might had miscalculated somewhere in their experiment. As far as the measurements of the stars are concern, many of these sizes have recently been confirmed by the Hubble Space telescope.
Even if they are off by a little bit there are stars out there that are much larger than our Sun. You can very easily seen these stars in the constellations without the aid of a telescope and they are very far away and are much brighter than other stars out there.
Those two facts tells us these stars must be much larger than the Sun. LoneStar77, thanks for your comment. I will make your suggested corrections in the my hub. There is a lot of information out there and sometimes they are wrong or are presented in the wrong context. You sound like you know what you are talking about here when it comes to astronomy. I think I can learn a thing or two about astronomy from you. Again thanks. Melpor, an interesting hub. Astronomy has been a passion of mine for over 50 years.
I hope you don't mind a little hard critiquing. My own calculations show the sun at Also, you say that the sun is 10 times larger than Jupiter. This can be misleading. Are you talking about diameter or volume? The sun is approximately 9. But when you say that the Sun is times larger than Earth, I have no idea where you're getting this figure. Comparing diameters, the Sun is times greater than Earth. Comparing volumes, however, the Sun is roughly 1,, times the volume of Earth.
The Sun's membership in the main sequence is not a function of electromagnetic terms as you state, but more a function of the fuel it burns -- hydrogen versus the heavier elements, helium, carbon, etc. And luminosity is not equivalent to color. There are very dim low luminosity red dwarfs and there are very bright high luminosity red giants -- same color, but widely separated luminosities. The Sun is a "yellow" star because the greatest strength of its output is in the yellow band of frequencies.
Even so-called "red" stars are emitting in a broad range of "colors," just as is our Sun, but their peak frequency is in the red band. The spectra emitted by all stars forms a bell curve across all visible frequencies. Even the so-called "red" stars emit in green and blue bands, but not as much as the hotter stars.
You mentioned with Rigel that it is 85, times as bright, but 66, more powerful than the Sun's radiation output. Now, "bright" usually indicates visible radiation which is not all of the output spectrum. Somehow, I think you have the numbers mixed up. Total output or bolometric magnitude should be larger than visible output visible magnitude. In your discussion of the Pistol Star, you might say brightest "known" star in the galaxy.
There may be others more bright.
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