presolar grains tagged posts

Learning more about Supernovae through Stardust

Pair of presolar grains from the Murchison meteorite. Credit: Argonne National Laboratory, Department of Energy

Most of the diverse elements in the universe come from supernovae. We are, quite literally, made of the dust of those long-dead stars and other astrophysical processes. But the details of how it all comes about are something astronomers strive to understand.

How do the various isotopes produced by supernovae drive the evolution of planetary systems? Of the various types of supernovae, which play the largest role in creating the elemental abundances we see today? One way astronomers can study these questions is to look at presolar grains.

These are dust grains formed long before the formation of the sun...

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Meteorite contains the Oldest Material on Earth: 7-billion-year-old stardust

This is a fragment of the Murchison meteorite. The total mass of the meteorite’s fragments collected is around 100 kg, or 220 pounds.Field Museum

The ancient stardust reveals a ‘baby boom’ in star formation. Scientists have discovered the oldest solid material on Earth: 7-billion-year-old stardust trapped inside a meteorite. This stardust provides evidence for a ‘baby boom’ of new stars that formed 7 billion years ago, contrary to thinking that star formation happens at a steady, constant rate.

Stars have life cycles. They’re born when bits of dust and gas floating through space find each other and collapse in on each other and heat up. They burn for millions to billions of years, and then they die...

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