Giant Aliens' Homeworld (The Invaders)

This unnamed terrestrial planet is home to a species of giant aliens, and the site of a confrontation between a giant alien and human astronauts.

Geology
The giant aliens' homeworld resembles Earth, although it is presumably far larger.

Environment
The planet has an unknown environment, although its gravity appears Earth-like. Human astronauts who visited the planet wore armored pressure suits, making it likely that the giant aliens' homeworld bears an atmosphere that is deadly to humans.

Inhabitants
The primary inhabitants of the planet are a non-spacefaring agrarian species of giant human-like aliens.

Flora
The planet is known to have Earth-like flora, but several times larger, scaled to the size of the giant aliens.

History
At some point in the future, the giant aliens' homeworld was found by humans, with two human astronauts from the US Air Force being sent to the planet. The astronauts attempted to make contact with an elderly female giant alien, but the encounter quickly turned hostile after the giant alien kicked an astronaut down an open trapdoor, with the astronauts retaliating with their energy weapons and anything they could pick up. After one astronaut was killed, the giant alien managed to destroy their ship, killing the other astronaut. US Air Force commanders who received the last transmission from the astronauts decided not to retaliate, instead opting to stay away from the giant aliens' homeworld.