I think Celestia could be a good one. I also thought about SpaceEngine, but AFAIK it was kind of terrible at generating realistic planetary systems, among other things (pricey, huge, etc.). Source: over 1 year ago

Celestia was something I played with before. Pretty interesting. Source: over 1 year ago

Celestia looks as though it would do it. Source: over 1 year ago

I'm looking for data and software to visualize the Apollo 17 trajectory (especially the "powered descent", lunar rendezvous and entry). I'm thinking of using celestia. I'm look for a data tables as well (time stamp, position for each part of the stack). Any tips are appreciated. Source: over 1 year ago

Yes, that's Celestia most likely. I'm not sure it is still maintained though. Source: over 1 year ago

NASA has a good set of open source projects available for public use: https://code.nasa.gov/. - Source: Hacker News / 9 months ago

Yes, this is no-cost but not necessarily open source. NASA open source software can be found at: https://code.nasa.gov/. - Source: Hacker News / 10 months ago

As for public telemetry it might be hard to get it for free as satellite owners do it for money. NASA maintains a public software page at code.nasa.gov and software.nasa.gov which includes OpenMCT mission control software that can do simulated data. Source: over 2 years ago

Don't underestimate the strength of personal projects. If you ask a professor about their research, I find very often, they ask about things you have done in the past, which sort of feels like shit if youve done nothing huh? I know people who made cloud chambers or shot ions or massive simulations in HS and I was like, a theatre kid which is so irrelevant. BUT. The reason they ask this is that previous experience... Source: about 3 years ago

This would be a place to start. Https://code.nasa.gov/. Source: about 3 years ago