But then we are Sol centric thinkers... the majority of stars are twins... how would that effect the orbits of planets...
In the 1980s I played a computer game on my Amiga 500 computer... it was called Frontier II and it was totally brilliant. It came on one floppy disk and was about 880KB of amazing fun... you could buy ships, you could fight pirates, you could do jobs for governments, you could trade, you could mine... the graphics understandably were not amazing but certainly good enough and it had an awesome map of the galaxy. The planets in the game were of course largely made up, but you could fly around in a space ship and land on planets... either in space ports in the star systems near earth, and space stations orbiting planets and moons and some asteroids... or you could land manually on planets and moons... it was awesome and totally amazing to fit on just one floppy disk.
The interface was simple and straight forward and could show the cockpit of the space craft or external views.
To be honest I used to cheat. What you could do was buy a small ship... the smallest one with decent weapon options and then load up hydrogen fuel and then take off and fly out in to empty space away from policed areas and then dump fuel... a bug in the software jettisoned the one ton of fuel, but you kept the fuel but it freed up one ton of space... so as you jettisoned more and more the capacity of your ship increased and increased... the only problem was that sometimes you collided with the jettisoned fuel which was identified as garbage. So you get a tiny ship with a small engine and you fly out to the middle of no where and dump 5,000 tons of fuel meaning you have 5,000 tons of free space in your tiny little ship, so you buy a bigger gun and you buy some shield generators... the more you have installed the more effective they are and being able to increase your internal volume to any size you like means you can carry enormous guns only star destroyers could carry and when you put enormous engines then your acceleration becomes enormous and your ability to jump to light speed means you can jump hundreds of light years per jump instead of 5-10 with your original engine. More importantly you can add extra stuff like self repair systems, navigation systems, missiles, jammers, and still have space for transporting people or cargo to make money. You can also carry mining equipment so you can go out to the deep dark reaches of the galaxy to mine for all sorts of stuff and then take it to places that have a shortage of what ever you mined to make the best profit.
There are always enemy ships that will attack you of course so there is combat as well.
You can speed up and slow down time so if you need to cover enormous distances in a huge star system you can accelerate time so a day passes in a second and then push the thrust key to accelerate to enormous speeds.
The modeling is excellent... there is momentum and gravity and an X in the HUD shows the direction you are heading in and your speed is shown relative to nearby objects... so if you take off from Moscow on earth and head towards a space station at the start your airspeed is relative to earth but as you get close to the space station it changes to speed relative to the space station... and as you get really close to the space station you get captured by its gravity and start spinning with it (which is probably not so realistic but makes docking easier... perhaps they have a tractor beam or something..)
I must go and dig that game out again and work out how I can play it... anyone know any good Amiga 500 computer emulators for Linux?