Related Experiment Videos
All the observed universe has contributed to life
1Department of Animal Biology, University of Pennsylvania, Philadelphia 19104-6046.
Summary
All atoms in living matter originated from stars across the universe, including those producing gamma rays. Humans continuously generate new nuclei through natural radioactive decay processes.
Area of Science:
- Cosmic nucleosynthesis
- Astrobiology
- Nuclear physics
Background:
- The origin of elements in living organisms is a fundamental question in astrobiology.
- Previous research has explored stellar nucleosynthesis as the source of elements.
Purpose of the Study:
- To present evidence linking the origin of atoms in terrestrial life to stellar processes across the universe.
- To quantify the continuous production of specific nuclei within the human body via radioactive decay.
Main Methods:
- Analysis of cosmic high-energy gamma ray production data.
- Calculation of radioactive decay rates for specific isotopes within a standard human mass.
Main Results:
- Evidence suggests that atoms comprising living matter on Earth originate from stars in our galaxy and beyond, particularly those emitting high-energy gamma rays.
- A 70 kg human continuously produces approximately 7 3He, 600 40Ca, and 3000 14N nuclei per second from the decay of 3H, 40K, and 14C.
Conclusions:
- The elemental building blocks of life on Earth have a universal cosmic origin.
- Radioactive decay within the human body is a constant source of new atomic nuclei, highlighting ongoing nuclear processes in biological systems.