system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Other than fixing that pesky hole that if it gets shot everything explodes issue, were there any other significant changes of the second Death Star over the first?
gpt
The most obvious change is that the second death star was larger than the original. This wasn't just to make it more intimidating, but it allowed room for a larger, more powerful, and more advanced reactor. 

This allowed the superlaser to have a much faster charging speed, which turned it from simply a planet-killer into a viable weapon against starships. It also had more advanced computers, allowing its primary weapon to be more accurate. 

Aside from that, and the changes to both the reactor and the thermal exhaust system which negated Galen Erso's sabotage of the design, the second death star had thousands more conventional weapon emplacements.