Briefly explain what we understand the inside of a neutron star is made of, from its core to its crust. 3) Explain the discovery and measurement of the ultramassive black hole at the center of galaxy M87: a) How was the existence of the black hole in M87 first demonstrated with the HST in the 1990s? b) How was it further measured in 2019 using the global Event Horizon Telescope? 4) Where should you look if you want to locate the supermassive black hole in the center of our galaxy? 5) Briefly: What are quasars?

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