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DTSTART;TZID=America/Los_Angeles:20260313T193000
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UID:10001751-1773430200-1773437400@www.ocastronomers.org
SUMMARY:General Meeting – March 2026
DESCRIPTION: Join Zoom\n\nFree and open to the public but per our host’s policy\, minors (under 18) are welcome to attend as long as they are accompanied by their parent or guardian at all times.\nThis meeting’s speaker will present inperson from the campus of the Chapman University.\n  \nThe Milky Way’s Central Black Hole:\n  \nLessons on accretion physics\n  \n \n  \nEvery large galaxy hosts a black hole at its center. These black holes’ feedback on their host galaxies shapes the evolution of galaxies and\, ultimately\, affects the Universe as a whole.  The Milky Way’s own supermassive black hole\, Sagittarius A*\, is the closest such object and the only one that can be studied in unprecedented detail – down to individual orbiting stars\, small infalling clouds\, and even its event horizon. Yet\, despite its proximity and decades of observations\, its behavior remains among the most challenging to explain. This talk explores Sagittarius A*\, its immediate surrounding\, and the challenges of describing black hole accretion physics. Particular emphasis is placed on the recent discovery of a wind associated with Sagittarius A*. The talk will also address what our own black hole can teach us about supermassive black holes across the Universe. \n \nElena (Lena) Murchikova is an astrophysicist interested in black holes. She is currently an Assistant Professor of Physics and Astronomy at Northwestern University. Originally from Moscow\, Lena holds two PhDs: one in astrophysics from Caltech and another in particle physics from Moscow State University. She completed her postdoctoral studies at the Institute for Advanced Study in Princeton and at Harvard University’s Black Hole Initiative. Outside of research\, Lena enjoys mountaineering and (drone) photography. \nViews: 0
URL:https://www.ocastronomers.org/calendar/general-meeting-2026-03/
LOCATION:Irvine Lecture Hall of the Chapman University\, 336 N Center St\, Orange\, CA\, 92866\, United States
CATEGORIES:General Meetings
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DTSTART;TZID=America/Los_Angeles:20260410T193000
DTEND;TZID=America/Los_Angeles:20260410T213000
DTSTAMP:20260418T231326
CREATED:20260404T193452Z
LAST-MODIFIED:20260404T193452Z
UID:10001756-1775849400-1775856600@www.ocastronomers.org
SUMMARY:General Meeting - April 2026
DESCRIPTION: Join Zoom\n\nFree and open to the public but per our host’s policy\, minors (under 18) are welcome to attend as long as they are accompanied by their parent or guardian at all times.\nThis meeting’s speaker will present online.\n  \nSupernovae\, Dark Energy\, and the\n  \nMystery of the Accelerating Universe\n  \n  \n \nType Ia supernovae are brilliant explosions of white dwarf stars and are some of the most powerful tools for measuring the universe. By comparing how bright these supernovae appear to how bright they really are\, astronomers can measure distances across billions of light-years. In the late 1990s\, these measurements led to one of the most surprising discoveries in the history of science: the expansion of the universe is speeding up\, driven by a mysterious phenomenon that was named dark energy. \nIn this talk\, we will explore how supernova discoveries (including contributions from dedicated amateur astronomers) feed into modern cosmological measurements. Along the way\, we’ll see how today’s observations are deepening the mystery of dark energy rather than closing the case. The accelerating universe remains one of the biggest puzzles in physics and supernovae are still lighting the way toward the answer. \n\nDavid Rubin is an Associate Professor of Physics and Astronomy at the University of Hawai‘i at Mānoa. His research focuses on using exploding stars called Type Ia supernovae to measure the expansion history of the universe and understand the nature of dark energy. He works on survey design\, calibration\, and statistical methods for current and next-generation observatories\, including the Nancy Grace Roman Space Telescope. \nDr. Rubin received his Ph.D. in physics from the University of California\, Berkeley working with Saul Perlmutter. He is still a member of the Supernova Cosmology Project and has authored or co-authored numerous publications on supernova cosmology and the accelerating universe. \nViews: 0
URL:https://www.ocastronomers.org/calendar/general-meeting-april-2026/
LOCATION:Irvine Lecture Hall of the Chapman University\, 336 N Center St\, Orange\, CA\, 92866\, United States
CATEGORIES:General Meetings
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