Physics and Star Wars
To estimate the effects of the second Death Star, Minton looks into its mass. According to estimated data from some students of Lehigh University, the steel mass needed for building one would be around 770 kilograms times the mass cubed in weight. This would give the Death Star of about ten to the power of nineteen kilograms in mass. Using this data, Minton produces equations that lead him to conclude the fragments would hit the moons surface so hard causing craters almost four times the size of the Chicxulub crater in Mexico. This impact would cause a planetary firestorm and vaporize all lifeforms on the moon.
Nien Nunb
With Nunb and Calrissian in the cockpit of the Millennium Falcon leading the attack, the Alliance Fleet arrived over Endor to find that the shield generator was still active, quickly realizing that the battle was a trap set by the Emperor, Darth Sidious, to engage and destroy the Rebel Alliance once and for all. The fleet remained over Endor and engaged Imperial forces in the hopes that Solo and his team would still be able to complete their mission and destroy the generator. The fleet kept to fighting TIE/LN starfighters and Star Destroyers, particularly once they learned that the Death Star was operational, after previously believing that it did not yet have the use of its primary, planet-destroying superlaser. Once Solo's team destroyed the shield generator, the Millennium Falcon entered the Death Star's superstructure and fired the shot that began a chain reaction that led to the battle station's destruction. Calrissian and Nunb were in a race against time as they outran the fireball that their attack created, and they escaped the Death Star just before it was consumed in a massive explosion. The Alliance was victorious, the Emperor was dead, and the Empire was shattered. Nunb joined his fellow Rebels on the surface of Endor where the Rebels held a celebration along with the native Ewoks, who helped Solo's team destroy the shield outpost.