Starship Lite: from rapid Interplanetary to Interstellar

Elon Musk stated that a stripped-down SpaceX Starship could become an interplanetary boost vehicle able to push probes towards the farthest objects in our Solar System. 

What other missions could the Starship ‘Lite’ do, and how quickly?

Actively Cooled Armor: from Helium to Liquid Tin.

We have seen designs for long ranged particle beams and powerful lasers. Could they be the end-all, be-all of space warfare? Not if we fend off their destructive power with actively cooled armor.

Let's have a look at the different cooling solutions, from high pressure gas to liquid metal, and evaluate their relative effectiveness.