 Van Tassel's early purported messages from Ashtar contained a great deal of apocalyptic material, which focused on concerns regarding the development of the soon to be tested hydrogen bomb.It was claimed that on July 18, 1952, Ashtar entered the solar system as Commander in Chief of the Ashtar Galactic Command to warn humanity of the dangers of detonating the H-bomb, including the destruction of the planet.The messages stated the space command was determined that humans would not destroy the Earth through the wrong use of nuclear power and that the Command was helping the human race.