User blog comment:MilitaryBrat/Hal Jordan vs Darth Vader/@comment-1683193-20131028175901/@comment-1683193-20131029163819

I wasn't there when those fights happened.

"generating anything from massive green fists to emerald rifles that can snipe from a planet away"-DC Website

Energy blasts have a range of at least 6,000 km.

"The weapons power is more an indication of the will of the user. Certain users (i.e. Hal Jordan) have been powerful enough to stagger even Superman. "-The wiki

Energy blasts can hurt Superman, who is capable of shrugging off nukes. His shields can tank said blasts.

"By the manipulation of anti-gravitons and directed molecular movement, the ring allows the user to fly at incredible speeds. In atmosphere, a Green Lantern has been known to fly as fast as Mach 10 in atmosphere by creating an aerodynamic envelope around his body. Towing others, usually within a bubble, his speed is limited to the twice the speed of sound or 1440 mph. In space, Green Lantern's speed can be significantly greater and has been known to approach 80% of lightspeed in normal space. Flight is possible at velocities exceeding light speed. In atmospheres, air friction is not a hindrance, since heat is either absorbed or reflected by the ring's field."-The wiki

Mach 10 top speed in atmo, and can fly close to the speed of light in space.

Sooo...yeah. Hal flies into orbit and blows Darth up from a thousand klicks off.