Every atom in your body was forged in a dying star. Find out how many.
Every atom in your body was forged inside a star. Hydrogen was made in the Big Bang. Carbon, oxygen, and iron were made inside stars and scattered when those stars exploded. The gold in your ring? Made in a neutron star collision. The calcium in your bones? Made in the core of a dying red giant.
You're about 70% water. That's hydrogen and oxygen. The hydrogen has been around since the beginning of the universe — 13.8 billion years. The oxygen was made inside a star that exploded billions of years before the Sun formed. The iron in your blood? Made in a supernova.
Carl Sagan said "we are made of star stuff." It's not poetry. It's chemistry. The atoms in your left hand likely came from a different star than the atoms in your right hand. You are a collection of stardust that happened to assemble into something that can look at the sky and wonder where it came from. The universe is thinking about itself — through you.
The Big Bang. Hydrogen nuclei (protons) formed in the first three minutes after the Big Bang. Every hydrogen atom in every water molecule in your body has been around for 13.8 billion years.
Supernova explosions. Massive stars fuse iron in their cores, then explode and scatter it into space. The iron in your hemoglobin was forged in a star that died before the Sun was born.
Your body is about 65% oxygen, 18% carbon, 10% hydrogen, and 7% other elements. The hydrogen in your body was created in the Big Bang — 13.8 billion years ago. But the carbon in your cells, the oxygen you breathe, the iron in your blood? All of that was cooked inside stars that exploded as supernovae before the Solar System even existed.
Every breath you take, every heartbeat, every thought — it's all stardust recombining for a brief, brilliant moment before returning to the cosmos.