History and specifics
The planet's system was described as being remarkably similar to Sol. Kwettir appeared green and blue from orbit, and had a blue sky. It supported a variety of animal life, including birds, but all were at a gigantic scale relative to Humans. Ants were five feet long and humanoids were upwards of 100 feet tall.
In 2269, the starship USS Enterprise entered the system and sent a shuttlecraft to make first contact. En route to the capital city, the shuttle was inadvertently shot down by a hunter with a rifle, and the landing party discovered the scale difference, as they were shorter than blades of grass. Eventually, arrangements were made for a follow-up visit by representatives to sign a treaty with the Federation. (TOS comic: "To Swiftly Go...")