Earth was the first planet to ever be added to Galaxy. It was added in Pre-Alpha and stayed through Alpha before it was removed in Beta. The planet served as a spawn point from when you first joined and game and also served as the icon and thumbnail for the game. The planet was located just under where the Mega Base is located today, indicating that it may have been a location marker for where the Mega Base was going to be placed. You could fly your spaceship to it, jump out and walk around. This was a very small planet when compared to others. It appears that Pangea Proxima is forming on it, suggesting a radical jump forward from our time.
Later, the Earth was re-added temporarily for the 2020 April Fools event, in which it served as the starting point for a quest line to receive the Baby Tyrant, although the Freedom Base was later used to pick up the quest.