That article contains a lot of errors.
Yes - the first big error came in the second paragraph. The most common elements in the body are oxygen, hydrogen, nitrogen, carbon, calcium and phosphorus. Of these, only hydrogen arose in the so called Big Bang. All of the rest, known as 'metals' by astrophysicists were produced inside massive stars before they exploded as supernovae after millions, or billions of years, depending on how big they were. More massive stars run through their life cycle far faster than others, and smaller ones like red dwarf stars will live vastly long lives, but are far dimmer.
Inside ordinary main sequence stars like the sun, hydrogen is fused into helium, then as the star consumes its hydrogen, it falls in on itself and the increased pressure at the core starts fusing helium into carbon and so on through the lighter elements over billions of years. After iron, only a supernovae can produce anything heavier. As stars die out they either puff out a large part of their material into space as dust and gas clouds, or they undergo catastrophic explosions as supernovae if they are higher mass than our sun. The sun will probably spend ten billion years slowly getting hotter before it becomes a red giant. At the moment, the sun is gaining in heat and radiation by about one percent every hundred million years.
We are all made out of star dust and water though, because our whole planet is made out of the dust and debris of previous generations of stars from long before our solar system formed and of course we are made out of that stuff.
Stars are massive element factories. There are four hundred billion of them in our Milky Way galaxy and we can see two thousand billion galaxies, many of which are at least as big as the Milky Way, though many are far more massive.
This is our nearest major galaxy - M31, or Andromeda. It contains a thousand billion stars - about two and half times as many as our own. As you look at it, you see it as it was long before any human walked on the earth - about two and a half million years ago. It took that long for the light to get here.
If we tried to travel to our nearest neighbouring star - Proxima Centauri, it would take 75,000 years if we were going about as fast as the Voyager probes ( about 35,000 miles an hour). To cross our own galaxy - 100,000 light years - at that speed would take about 1.6 billion years. Reaching the nearby Andromeda galaxy (2.5 million light years) would take 25 times that long - 41.6 billion years.
In way less than a billion years, the sun's increasing heat and brightness as it starts fusing helium into carbon will have evaporated all the oceans and water on our planet and the surface temperature on Earth will be like that on Venus - hotter than molten lead - about 500 centigrade.
By five billion years into the future, the sun will have inflated into a red giant extending well beyond the orbit of Mercury and Venus and possibly even that of the earth.
The future is hot.
arstechnica.com
eos.org
www.sciencealert.com
www.wbur.org
www.noahpinion.blog
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