Kind of a waste of time, though, isn't it? I'd be cheaper and just as effective to throw high velocity normal matter at the target.

At weapon levels, mirrors effectively become opaque to laser beams due to the energies involved - they'll just soak up the beam and explode like any other material. Your only real hope against weapon lasers is to either not be where it is, or have enough ablative armour (pray they're not using anything harder than UV) and structural strength to get out of the way before it drills through it or pounds the ship to bits (pulse lasers are unpleasant).

If the attacker is using x-ray lasers, odds are the umbrellas aren't going to save you. I'm a bit dubious that a puff of air is going to do terrible much to a weaponized laser in space either, honestly - you'll never get a dense-enough region of gas to meaningfully deflect the beam. Not to mention your attacker is going to be random-walking along with you to avoid return fire, which is going to make it pretty hard for the interceptor drone to be in the right place at the right time...

Space combat will probably be kinetic missile bombardment at exceptionally long range, while ships continuously manoeuvre to take advantage of the lightspeed delay in signal times to avoid incoming fire. Medium-range fighting might include lasers (particularly x-ray lasers if they can be made feasible) or particle beams out to a few light seconds, but kinetics will still rule. Not really sure if it would make sense to armour space warcraft; at space combat velocities, any kinetic weapon impact would likely mission-kill any target. It's possible I guess to try to armour against beams/lasers, maybe hide the crew module deep inside the fuel or something.

Planetary defense will be tricky, since anything in a predictable orbit is a sitting duck at practically any range, especially the planet itself. Massive orbital swarms of small defensive weapons, maybe? I'd sure hate to be living on a planet in a hot space war. :(

  No stealth, no fighter/bombers; both are pretty much unfeasible in space. Stealth just can't meaningfully be done, and fighters are better replaced with missiles or drone missile-buses.

Then again, the Heartland Institute are already known liars, which certainly tends to bias my view of their side of things.

Eh, a decent modern reactor with modern safeguards isn't going to see those sorts of problems, or at least they become much less likely. Fukushima was an old design and the company responsible for it never bothered to apply the recommended safety upgrades.

Engage NIMBYism in 3... 2... 1...

1+1=10 is entirely equivalent to 1+1=2, you're simply using another number system to represent it. It has nothing to do with opinion.

Opinion in this case would be 'binary is superior to decimal'.

Can't be a standard torus. You forgot about the nostrils.

Well, the energy required to mass-scatter the Earth against it's own gravitational binding energy is around 4e32J, or about 11 days of the Sun's total output. Which is insignificant compared to the power of the Force, but still nothing to sneeze at.