What groundbreaking discoveries has Reinhard Genzel made in astrophysics?

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Reinhard Genzel's discoveries in astrophysics raise questions about the nature of time and black holes. The discussion centers on the concept of time dilation near black holes, suggesting that from an external observer's perspective, objects never cross the event horizon. Participants clarify that while proper time allows an object to fall into a black hole, "our" time is an illusion that doesn't reflect local events. The conversation also touches on the nature of singularities, the relationship between mass and black holes, and the dynamics of event horizons. Ultimately, the complexities of black hole physics challenge conventional understandings of time and space.
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Here is a credible source:

https://www.youtube.com/watch?v=ZDxFjq-scvU

http://www.mpe.mpg.de/ir/GC

Reinhard Genzel:

Studied physics at the University of Freiburg and the University of Bonn where he did his PhD in 1978[2] and, in the same year, his PhD thesis on radioastronomy at the Max Planck Institute for Radio Astronomy.[2] He then worked at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. He then was a Miller Fellow from 1980 until 1982, and also Associate and Full Professor in the Department of Physics at the University of California, Berkeley from 1981. He became Scientific Member of the Max-Planck-Gesellschaft in 1986, and director at the Max Planck Institute for Extraterrestrial Physics in Garching and lectured at Ludwig-Maximilians-Universität München where he has been honorary Professor since 1988. Since 1999 he has also a joint appointment as Full Professor at the University of California, Berkeley.[2] He also sits on the selection committee for the Astronomy award, given under the auspices of the Shaw Prize. Genzel is fluent in German and English.

Work
Reinhard Genzel studies infrared- and submillimetre astronomy, and he and his group are active in developing front-line ground- and space-based instrumentation for their astronomy research. He and his group were the first to track the motions of stars at the centre of the Milky Way and show that they were orbiting a very massive object, probably a black hole.[3] Genzel is also active in studies of the formation and evolution of galaxies.
 

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