Your fledging civilization needs to develop a way to defend its ships against certain types of energy weapons from science fiction. You would like to have the ability to absorb,nullify,deflect, the pummeling as much as possible. You would like the system to be as light, compact, efficient as possible, and replaceable without a major overhaul. The caveat is: You may not use scifi force fields. No bubbles of pink magic may protect your ship. Realistic manipulation of any combination of energy, plasma, and matter, combined with sensory and information is acceptable. In essence, you can make plasma windows, magnetic fields, masers, lasers, armor, superconductive skin,etc. Here are your hazards. Your system can be made specific to each hazard. 1 Galaxy class phaser blast. Assume neutrino decay theory if you want. 1 Ha'tak staff canon blast. 1 ISD turbolaser blast. 1 blast from a giant laser, as big as you think you can defend from 1 Hit from a ship mounted HALO universe MAC. 1 Hit from a Mass Effect ship mounted rail gun. 1 Hit from a Demarchy railgun. 1 Hit from a photon torpedo 1 Hit from a Mark 9 gatebuster 1 full broudside from the Galactica. Your system does not need to be ideal in every circumstance, for instance a full galactica broadside might be defended against from long range only.