Look up at the night sky and the stars can seem impossibly distant, disconnected from the ordinary details of human life. Yet some of the atoms that make up our bodies have a remarkable history that stretches far beyond Earth. Astrophysicist Jennifer Wiseman captured this connection in the simple statement, ‘Our bodies actually depend on other stars.’ Her words point to one of the most extraordinary ideas in astronomy, the elements essential to life were forged through processes involving stars. The quote has been highlighted by the Magis Centre as part of its collection of inspirational science reflections.
Quote of the day by Jennifer Wiseman
“Our bodies actually depend on other stars”
What does this quote mean
Wiseman’s statement is a reminder that humans are not separate from the wider universe. Our bodies contain elements such as carbon, oxygen, nitrogen, calcium and iron, and many of the heavier elements were produced through stellar processes and dispersed into space before eventually becoming part of planets, living organisms and, ultimately, us. In that sense, looking at the stars is also looking at part of our own history.
The atoms in our bodies have a cosmic history
The universe did not begin with all the elements that exist today in their present forms. Stars became enormous natural laboratories where nuclear reactions produced heavier elements from lighter ones. When stars reached the end of their lives, some released those elements into space. Over immense stretches of time, that material became incorporated into new generations of stars, planets and other cosmic objects. Earth formed from this enriched material, meaning the ingredients needed to build living organisms have a history that predates our planet itself.
Even the iron in our blood has a story
Some of the most familiar elements in the human body have surprisingly dramatic origins. Iron, for example, is essential for haemoglobin, the protein that allows red blood cells to carry oxygen around the body. The iron found on Earth was ultimately created through stellar processes before becoming part of the material from which our planet formed. This makes an ordinary part of human biology feel almost astronomical. Something as familiar as the blood flowing through our veins contains material with a history reaching back to ancient stars.
We are part of a much bigger system
The idea of being connected to stars is more than a poetic description. It reflects how matter moves through the universe. Stars form from clouds of gas and dust, transform elements through nuclear reactions and eventually return material to space. That material can later become part of new stars, planets and potentially living systems. The process means that the universe is not simply a distant backdrop to human existence. The matter around us and within us is part of the same cosmic story.
Science can make the familiar seem extraordinary
We often think of the human body in terms of organs, cells and molecules. Astronomy encourages us to zoom out much further. The carbon in a cell, the oxygen we breathe and the calcium that strengthens our bones can all be traced through a much larger story involving the formation and evolution of the universe. This change in perspective is one of the beautiful things about science. A familiar object does not become less ordinary because we understand it better. Instead, its hidden history can make it far more remarkable.
Looking at the stars can also mean looking at ourselves
For Wiseman, who has spent her career studying the universe, the connection between human beings and the cosmos offers a powerful reason for wonder. The stars may be millions or billions of kilometres away, but their history is woven into the material world around us. The night sky therefore tells a story that is not entirely separate from human life. In a very literal sense, part of that story is inside us.
Why this quote still matters today
Modern astronomy has given us an increasingly detailed picture of how the elements that make up planets and living organisms were produced and distributed throughout the universe. Wiseman’s short statement turns that enormous scientific story into something personal, the universe is not merely something we observe; we are made from its history. The enduring lesson is beautifully simple. The next time you look at a sky filled with stars, you are not looking at something completely distant from yourself. You are looking at the ancient cosmic processes that helped provide the raw materials from which Earth, life and our own bodies eventually emerged.