What are the best PC simulators that simulate physically realistic spacecraft to let you be an Astronaut in?

The FlightGear flight simulator project is an open-source, multi-platform, cooperative flight simulator development project. It also simulates space flight in Earth's orbit. FlightGear's flight dynamics engine (JSBSim) is used in a [2015 NASA benchmark](https://en.wikipedia.org/wiki/FlightGear#Benchmark_testing_by_NASA) to judge new simulation code to the standards of the space industry. It's used professionally for research and development as well as non-professionally. [Wiki entry on FlightGear](https://en.wikipedia.org/wiki/FlightGear). [Tours of real locations inside the game](https://www.flightgear.org/category/tours/). [FlightGear wiki](https://wiki.flightgear.org/Main_Page). FlightGear 2020.3.8 and later has 3d models of buildings, roads, cities etc. , based on Open Streetmap (OSM) data and automatic generation, for the whole world.