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Abstract:
Supernovae and kilonovae (neutron-star mergers) are the sources of the heavy elements in the Universe, making life possible, but a stellar explosion within about 10 parsecs of Earth could cause a mass extinction. There is increasing evidence from deposits of live (radioactive) isotopes on the ocean floor, on the lunar surface and in Antarctic ice that at least two stellar explosions have occurred within 100 parsecs of Earth during the last 10 million years. Data from lunar sample return missions such as Chang'e 5 and Artemis could help clarify the natures of these explosions, helping us address key questions. Could a closer explosion have caused a mass extinction in the past? What are the prospects of such an event in the future?
Biography:
Professor John Ellis earned his Ph.D in theoretical particle physics in 1971 at Cambridge University. As the world-renowned particle physicist, he was awarded the Maxwell Medal and Prize (1982) and the Paul Dirac Medal and Prize (2005) by the Institute of Physics. He is an Elected Fellow of the Royal Society of London since 1985 and of the Institute of Physics since 1991. He won the First Award in the Gravity Research Foundation essay competition (1999 and 2005). Professor Ellis is currently the Clerk Maxwell Professor of Theoretical Physics at King's College London. He has been appointed Commander of the British Empire (CBE) since 2012. He was twice the Deputy Division Leader for the Theory Division of CERN, and served as Division Leader for 1988–1994. He was a founding member of the LEPC and the LHCC. He is the Chair of the committee to investigate Physics Opportunities for Future Proton Accelerators, and is a member of the extended CLIC (Compact Linear Collider) Steering Committee.
Host：Prof. Hong-Jian He
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