A list detailing all alien activity on Earth prior to the 22nd century.
65 Million BCE
An unknown insectoid race visits Earth and studies various bird and insect specimens, later transporting them to the planet Setifora.
One of the many Forerunner observers witnesses the dropping of the 'Fat Man' bomb in Nagasaki. Observers are urged to leave Earth as soon as possible.
Alien Spaceship crashes in the town of Roswell, New Mexico.
Delvans do a survey of Earth to study Humanity's technology and overall intelligence.
The Plu'ani from Mykhatsi, visit Earth but clandestinely due to their contact directive.