Battlestar Galactica
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What I was really impressed with was the physics. Asside from the standard SF deviation of FTL drives and the unstated existence of FTL communication, the space physics are very realistic.
The space ships have inertia. When their thrusters stop, the ship keeps moving. They flip around while still moving and attack. The fighters have gas thrusters to maneuver.
The weapons are kenetic: hypervelocity projectiles and nuclear-tipped missles. It would be interesting to see some laser weapons presented in a realistic way, but BSG doesn't have them at all.
It's really cool to see a SF show present space combat realisticly.
I'd be even more impressed if the show delt with the problems of light-speed sensors and communications. And then there's my favorite hobby horse, ever since I read Flying to Valhalla by Charles Pellegrino, the ultimate space warfare weapon: accelerating a ship/object to near-c and crashing it into your favored target (planet, sun, ship, whatever). Because it's flying nearly as fast as light, it's impossible to detect until it's too late. Because of relativity, the mass is huge. F=ma, so such a weapon would be very powerful.