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Utilizing simulation software, Dean Regas will guide guests through a family-friendly exploration of the mind-boggling scale of the universe. Along the way you\u2019ll stop at the Moon and individual planets, then you\u2019ll make the jump to light speed and head to interstellar space and see all the galaxies in the universe. \n\nThis event is part of the Observatory's Saturday open house programming. Join us 12-11 pm and tour the historic building, view our exhibits, and participate in hands-on astronomy activities. And if weather permits, you'll be able to view the sun with our solar telescope and the night sky with historic and modern telescopes. Families welcome, admission is always free, and registration is not required.\n\nDean Regas is a renowned public speaker, author, educator, national popularizer of astronomy, and an expert in observational astronomy. 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How do you find constellations like Orion, Gemini, and Taurus? When can you see the planets? In this family-friendly presentation based on his book of the same name, astronomer Dean Regas will demonstrate the basic tips and tricks to identifying stars, constellations, planets, and more in the night sky. You'll soon be on your way to finding 100 Things in the Night Sky. \n\nThis event is part of the Observatory's Saturday open house programming. Join us 12-11 pm and tour the historic building, view our exhibits, and participate in hands-on astronomy activities. And if weather permits, you'll be able to view the sun with our solar telescope and the night sky with historic and modern telescopes. Families welcome, admission is always free, and registration is not required.\n\nDean Regas is a renowned public speaker, author, educator, national popularizer of astronomy, and an expert in observational astronomy. 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Exo-planetary systems can be very different from our own, and diverse from each other. Understanding this diversity is a major goal of modern planetary science. The formation of planetary systems is not fully understood, but major advances have been obtained in the last 10 years. New concepts have been proposed, such as the streaming instability for the formation of planetesimals and pebble accretion for the formation of protoplanets. It is also now clear that planets forming in the proto-planetary disks have to migrate during their accretion, if their mass exceeds a few times the mass of Mars. Accretion and dynamical evolution are therefore very coupled processes. This leads to complex evolutions, very sensitive to initial conditions and fortuitous events, that are the key to understand the observed diversity of planetary systems. The early formation of Jupiter and its limited migration due to the formation of Saturn are two fundamental ingredients that determined the basic structure of the Solar System. There is also evidence that the vast majority of planetary systems become unstable after the removal of the protoplanetary disk. The effects of this instability are very different depending on the masses of the planets involved. Our Solar System also experienced a global instability, but fortuitously, our giant planets did not develop large orbital eccentricities.\n\nBio: Dr. Morbidelli is one of the world's top experts in the dynamical history of the solar system (as one example, the Nice model of giant planet instabilities as the origin of the late heavy bombardment). He is also an expert in the area of planet formation writ large, with numerous contributions on the origins of planetary systems. He won the Urey Prize from the planetary science division of the American Astronomical Society in 2000, the Grand Prix Mergier-Bourdeix from the Acad\u00e9mie des Sciences in 2009, the CNRS Silver Medal in 2019, and is a member of the Coll\u00e9ge de France.\n\nThe talk will be followed by refreshments and time for discussion until 5:00 p.m.\n\nThe Departments of Physics, Astronomy, CLASP, and Earth & Environmental Science have jointly established a new initiative named the Center for Habitable Planetary Systems (CHPS).", "occurrence_notes":null, "guid":"147384-21900952@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/147384", "building_id":"1005047", "building_name":"Palmer Commons", "building_official_id":1005047, "campus_maps_id":"188", "campus_maps_link_path":"palmer-commons", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/palmer-commons", "room":"Atrium 4, North", "location_name":"Palmer Commons", "has_livestream":0, "cost":"", "tags":["Astronomy"], "website":"https:\/\/lsa.umich.edu\/physics", "links":[ { "type":"other", "url":"https:\/\/lsa.umich.edu\/physics", "title":"U-M Department of Physics Website" } ], "sponsors":[ { "group_name":"Department of Physics", "group_id":"1965", "website":"" }, { "group_name":"Earth and Environmental Sciences", "group_id":"3170", "website":"http:\/\/www.lsa.umich.edu\/earth" }, { "group_name":"Climate and Space Sciences and Engineering", "group_id":"3320", "website":"http:\/\/aoss.engin.umich.edu\/" }, { "group_name":"Astronomy Colloquia", "group_id":"3797", "website":"" } ], "image_url":"", "image_description":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/147384\/qrcode.png", "occurrence_count":1, "first_occurrence":21900952 } , { "id":"138950-21884312", "datetime_modified":"20260427T090939", "datetime_start":"20260423T120000", "datetime_end":"20260423T170000", "has_end_time":1, "date_start":"2026-04-23", "date_end":"2026-04-23", "time_start":"12:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Watcher of the Sky: Making and Remaking the Detroit Observatory", "occurrence_title":"", "combined_title":"Watcher of the Sky: Making and Remaking the Detroit Observatory", "event_subtitle":"", "event_type":"Exhibition", "event_type_id":"7", "description":"The Detroit Observatory was once a hub of astronomical discovery that put the University of Michigan on the map as a world-class research institution. 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I present the deepest stellar halo map of the nearby galaxy M94, revealing that it has one of the smallest and most metal-poor stellar halos among MW-mass galaxies (M*=2.8x10^10 M\u2609, [M\/H] ~-1.4) and indicating that its dominant merger was with a galaxy less massive than the Small Magellanic Cloud (SMC). M94 also hosts the largest pseudobulge in the Local Universe, but this work suggests that it was shaped primarily by secular processes rather than by this dominant merger. I also illuminate the structural diversity of faint satellite galaxies around M81, finding among them the most compact (DWJ0954+6821), most concentrated (D1006+69, n ~ 5), and one of the most elliptical (D1009+68, \u03f5 ~ 0.57) dwarfs known in the Local Volume. This work improves on ground-based characterizations of these systems and reveals that all four satellites are metal-poor and quenched, with no evidence for tidal stripping despite their varied ellipticities. Lastly, I successfully demonstrate the feasibility of wide-field, multi-object fiber-fed spectroscopy in a low signal-to-noise regime for probing halo kinematics beyond the Local Group, presenting the first measurement of the line-of-sight (LOS) velocity and velocity dispersion of NGC 253's stellar halo. I find that the stellar halo exhibits prograde angular momentum and detect kinematic substructure coincident with its known southwestern shell, consistent with a recent accretion event. This work lays the foundation for conducting resolved stellar population science with next-generation observing facilities such as the Rubin Observatory, Roman Space Telescope, and the Extremely Large Telescope.", "occurrence_notes":null, "guid":"148013-21902844@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148013", "building_id":"1000198", "building_name":"Detroit Observatory", "building_official_id":1000198, "campus_maps_id":"189", "campus_maps_link_path":"detroit-observatory", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/detroit-observatory", "room":"", "location_name":"Detroit Observatory", "has_livestream":0, "cost":"", "tags":["astronomy"], "website":"https:\/\/umich.zoom.us\/j\/9291182577", "links":[ { "type":"livestream", "url":"https:\/\/umich.zoom.us\/j\/9291182577", "title":null } ], "sponsors":[ { "group_name":"Department of Astronomy", "group_id":"1178", "website":"" } ], "image_url":"", "image_description":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/148013\/qrcode.png", "occurrence_count":1, "first_occurrence":21902844 } , { "id":"148264-21903462", "datetime_modified":"20260513T124418", "datetime_start":"20260522T110000", "datetime_end":"20260522T120000", "has_end_time":1, "date_start":"2026-05-22", "date_end":"2026-05-22", "time_start":"11:00:00", "time_end":"12:00:00", "time_zone":"America\/Detroit", "event_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology", "occurrence_title":"", "combined_title":"Cosmo-Astro Seminar | Supernova Cousins: Leveraging Galaxy-group Information to Improve Type Ia Supernova Cosmology: Allison Blum (University of Hawaii at Manoa)", "event_subtitle":"Allison Blum (University of Hawaii at Manoa)", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"Type Ia supernovae (SNe Ia) are a cornerstone of precision cosmology, but at low redshift their accuracy is increasingly limited by systematic uncertainties. 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With this sample, I compare distance scatter across environments and test the limits of how well we can use them to improve SN cosmology.", "occurrence_notes":"Leinweber Institute for Theoretical Physics", "guid":"148264-21903462@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/148264", "building_id":"1000208", "building_name":"Randall Laboratory", "building_official_id":1000208, "campus_maps_id":"133", "campus_maps_link_path":"harrison-m-randall-laboratory", "campus_maps_link":"https:\/\/maps.studentlife.umich.edu\/building\/harrison-m-randall-laboratory", "room":"3247 Neal Lab", "location_name":"Randall Laboratory", "has_livestream":0, "cost":"", "tags":["Astronomy"], "website":"https:\/\/lsa.umich.edu\/litp\/news-events\/all-events\/seminars\/um-cosmology-group-seminars.html", "links":[ { "type":"other", "url":"https:\/\/lsa.umich.edu\/litp\/news-events\/all-events\/seminars\/um-cosmology-group-seminars.html", "title":"Cosmo - Astro Seminar Schedule" } ], "sponsors":[ { "group_name":"Leinweber Institute for Theoretical Physics Cosmology Astrophysics Seminars", "group_id":"5046", "website":"" }, { "group_name":"Department of Physics", "group_id":"1965", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics Seminars", "group_id":"4311", "website":"" }, { "group_name":"Leinweber Institute for Theoretical Physics", "group_id":"4312", "website":"" } ], "image_url":"", "image_description":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "qr_code_url":"http:\/\/events.umich.edu\/event\/148264\/qrcode.png", "occurrence_count":1, "first_occurrence":21903462 } , { "id":"138950-21900804", "datetime_modified":"20260427T090939", "datetime_start":"20260522T120000", "datetime_end":"20260522T170000", "has_end_time":1, "date_start":"2026-05-22", "date_end":"2026-05-22", "time_start":"12:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"Watcher of the Sky: Making and Remaking the Detroit Observatory", "occurrence_title":"", "combined_title":"Watcher of the Sky: Making and Remaking the Detroit Observatory", "event_subtitle":"", "event_type":"Exhibition", "event_type_id":"7", "description":"The Detroit Observatory was once a hub of astronomical discovery that put the University of Michigan on the map as a world-class research institution. 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