When did the sun become a star

how long until the sun explodes?

Our sun is an average star, type G to be precise, and it will never explode. An exploding star is called a super nova, and a star must be much larger than our sun for this to happen.

What will happen is in several billion years the sun will use up the hydrogen in its core, and will start to collapse. This will cause the ignition of other elements, and the sun will expand into a red giant. It will be come so large earth will be swallowed up!

The last phase will occur when all the fuel is gone, the star will contract into what is called a white dwarf, and will gradually cool and become dark some time in the distant future.

How does a neutron star differ from a white dwarf? How is it created? What keeps it from further collapse?

A white dwarf is a dead star with the diameter of the Earth, and a mass similar to the Sun's. Stars up to 8 times the Sun's mass will end their lives as a white dwarf. Electron degeneracy prevents the star from collapsing further. The maximum mass of a white dwarf is around 1.3 Sun masses.
A star heavier than about 8 times the Sun's mass will not be able to lose enough mass to become a white dwarf but will become either a neutron star which has over 1.3 times the Sun's mass but less than 3 times the Sun's or a black hole. The neutron star is composed of neutrons.

what is the name of the biggest star?

My sister and I are fighting what is the name of the biggest star. My sister says the sun and thats why we'er rotating around it.I say Ariuse or something like that.Can you help us stop fighting? Do you have the answer? ( PS. I know I'm not talking about Siriuse) in the whole unizers in the whole universe

The Sun is nowhere near the largest star known to astronomers; in fact, it's really not even a large star at all. The only reason we're revolving (not rotating) around it is because the Earth and other local planets (Mercury, Venus, Mars, etc.) were formed from a disk of dust that surrounded the Sun when it was first forming. We've been revolving around it ever since.

Many stars in the night sky are larger than our Sun; some are a LOT larger. They only look like tiny pinpricks because they're so incredibly far away. The Sun is 150 million kilometers away, but the nearest star after that, Proxima Centauri, is 40 TRILLION kilometers distant...about 267,000 times as far away as our Sun. And remember, that's the CLOSEST star after our Sun; every other star is farther away still.

The LARGEST star we currently know of is VY Canis Majoris. It is about 5000 light years away from Earth and it is about 2000 times further across than our Sun. If VY Canis Majoris were placed in the center of our Solar System, it would swallow up every planet up to Saturn. Now THAT'S a huge star.

I hope that helps. Good luck!

EDIT: shaunandden_81, I'm not sure I understand what you're saying. When did she say "in this Solar System"?

What will happen when the sun dies?

When our sun dies:
Our sun is a fairly small star, so before it dies, it will become a white dwarf. Right now, the sun is ~4.5 billion years old. When it gets to be ~6 billion years old, it will start getting warmer and larger. As the sun gets hotter, Earth's temperature will rise and get too hot to sustain life. At ~10 billion years, it will become a red giant, which is many times the size of the original star. At ~11 billion years, it will shrink drastically in size and become a white dwarf star. White dwarves pulsate, blowing off a layer of the star with each pulsation. These pulsations will destroy the planets.

Are the scientific calculations for the habitable zone based on just our star the sun?

Our habitable zone is according to our SUN. If there is a star with a planetary system like ours, but this star many times bigger than our sun, does that mean the habitable zone for that star is greater, or is it just all about the distance? Basically, are the habitable zones dependent to size and of each star or distance? What about energy, we know that there are stars that are much more brighter and hotter than our sun, does this affects a solar system habitable zone? No answers?

No, astronomers can calculate the habitable zone for any star if they know its luminosity. By the way, Ken is completely wrong to say that the habitable zones of Red Giants and larger stars are closer in than with the Sun. Red Giants may have cooler surface temperatures, but they are many times more luminous than the Sun because they are so big. Therefore, their habitable zones will be farther out. Habitable zones are not fixed, they migrate as a star ages. When our Sun was younger, the habitable zone was slightly closer in, and as it ages it will move out. At some stage, it will move out beyond the Earth, whereupon all life on this planet will cease.

For a very good explanation of habitable zones, follow my link.

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