mn90403 Posted January 8, 2021 Share Posted January 8, 2021 https://ucla.zoom.us/meeting/register/tJEqduyupj0vGd3S0_52FsbHTbPjYr0sZQUj Meeting Registration Facebook Twitter LinkedIn Microsoft (Outlook) Topic UCLA Meteorite Gallery Lecture Series Description Title: Clocks in Rocks: How to date a solar system Lecturer: Dr. Sara Russell; Natural History Museum, London Our solar system was born over four and a half billion years ago, from a cloud of dust and gas called the protoplanetary disk. Examples of the first solids to be formed - calcium-aluminium-rich inclusions (CAIs) and chondrules -have survived in some meteorite samples to learn about these ancient times. In particular, we can determine how old these components are using lead isotopes, which places constraints on the formation time of our Sun and planets. Finer details can be provided by the isotope 26Al, which is a natural clock because it is radioactive and its abundance declines by half every 3/4 of a million years. By looking at how much of this isotope was present in each object when it formed we can therefore tell how old it is. However, this chronometer depends on knowing how much 26Al originally existed in the disk and how it was distributed. If we can work these details out, then we can use these data to determine the length of time it took to make CAIs and chondrules, and from this we can work out how long the dusty disk took to start to form planets. Time Jan 17, 2021 02:30 PM Feb 21, 2021 02:30 PM Mar 21, 2021 02:30 PM Apr 18, 2021 02:30 PM May 16, 2021 02:30 PM Jun 20, 2021 02:30 PM Time shows in Pacific Time (US and Canada) 3 Link to comment Share on other sites More sharing options...
Randy Lunn Posted January 18, 2021 Share Posted January 18, 2021 Sara gave a wonderful presentation today. Thank you for letting us know about the event. Link to comment Share on other sites More sharing options...
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