Were made of star dust, so which star?

Good guess, but you might be amazed to know that your wrong! It's currently impossible to say what star or stars your body came from, but we do know it was from a massive star(s) at least 8 times the size of the sun at least 4.6 billion years ago.

How do we know this? the only elements created after the big bang were hydrogen, helium and lithium. everything else was created inside star though fusion of lighter elements into heavier ones. We know it takes bigger and bigger stars to make the heavier elements. A star like the sun can never make things as heavy as Iron or gold. it takes a really big star. The problem is when a big star does make iron, it's all stuck in the core of the star under a lot of pressure and gravity. It takes a supernova explosion to send the heavier elements outside the core of the star. during this explosion, all the elements heavier than iron are made. You're 9% hydrogen by weight, so about 91% or more of you came from the inside of a massive star.

We basically are Star dust.

From the Big Bang, the first generation of stars were hydrogen in fusion making helium.

After they burnt out, they were massive enough to form supernova.

This spread the heavier elements far and wide and reached gas and dust clouds to eventually send them spinning into proto planetary discs.

Not the sun.

As earlier generations of stars were born and the more massive ones exploded, the dust from those stars enriched the gas that that next generation of stars and planets formed from.

Our sun and planets (and us) formed from a cloud of dust and gas that had been enriched by the debris from supernova explosions that occurred long before our solar system formed.

No... from one or more stars that lived, died, and exploded long before the sun came along. Our sun (and the whole solar system) is made from a cloud of material with heavy elements (iron, lead, gold, calcium, etc.) - that can only be created in the hearts of massive stars; those materials are only blasted into the unverse when that particular star dies - in a supernova explosion.

So, the matter that makes *us* comes from one or more very massive stars that died at least 5 billion years ago...

Probably of stardust that came from the star that gave birth to our sun and the planets of this solar system in its starburst. Since then, the earth and ourselves have been adopted by the sun. The sun may be a 4th or 5th generation star. We, seemingly, are made of stardust from a star, from a previous generation of stars, that went supernova giving birth to our solar system.

NO.

From a star long dead way after a super nova.

The Elements are only formed after a star explodes.

No, the star dust we are made of is from Thugolius Kitchionolo. Its a common misunderstanding, most people don't know a lot about space.

You're welcome

-Marina

any star - and it dont have to have died 5bill years ago

all it had to do is die long enough ago for the atoms it created to reach earth and be here after you were conceived, not when the earth was formed