The cosmic delivery service that may have seeded life on Earth
In short: How did the complex chemistry of life arrive on a molten, primordial planet? New research suggests our most vital biological building blocks were not homegrown. They were delivered from across the solar system by meteorites—fractured remains of ancient asteroids that acted as cosmic delivery vehicles.
To understand how life began, scientists are looking for 'volatiles'—compounds like water that turn into vapor at low temperatures. A research team led by Rayssa Martins from the University of Cambridge tracked the chemical element zinc to map where these materials originated. Because zinc has a unique composition when formed in meteorites, it serves as a chemical fingerprint for identifying the source of Earth's essential volatiles.
The study reveals a diverse origin story: approximately half of Earth's zinc came from the inner solar system, near our own planet. However, the other half originated from beyond Jupiter, the fifth planet from the sun. These materials were carried by 'planetesimals'—small rocky bodies that formed about 4.6 billion years ago as dust and gas accreted around the infant sun. Some of these early bodies were exposed to high levels of radiation from the young star, influencing their chemical makeup.
This suggests that life's ingredients are not localized but are distributed across the solar system. By identifying how these materials arrived on Earth via 'unmelted asteroids,' researchers hope to find clues for where life might emerge elsewhere. This search includes looking for specific conditions like liquid water—which functions as a solvent for chemical reactions—and carbon, the building block for organic compounds like proteins and fats.
Current efforts to live in space, such as those on the International Space Station, involve engineering environmental support systems that recreate these Earth-bound ingredients. By mastering how we sustain life in orbit, we gain a deeper understanding of the very mechanisms that make our home planet habitable.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Ingredients for Life: On Earth and in Space
- Also: Eight ingredients for life in space | Natural History Museum
- Also: The key ingredients for life on Earth came from space, new evidence suggests
To cite this card, link to https://intellectplus.co.uk/app/space-ingredients-for-life-on-earth-and-in-space-2.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Space · Latest · A–Z · All topics
