In 1816 was the year of no summer. The common explanation is that a volcano erupted reducing the amount of sun light that hit the earth making it much colder for that year. But really the Truth is much crazier.

Earth has been visited by extraterrestrials for 1000's of years, some wanting to see humans evolve technologically others wanting to stop or slow our knowledge due to our violent nature. Well after many decades of back and forth fighting, the anti-human ET's went all in and decided the only safe galaxy was one without Earth and started a chain reaction to destroy the sun. This was 1816.

But... we still have a sun you say. Yes but it isn't real. NASA (New American Science Academy) which was founded in 1690 in New York had been in close contact with the Pro-human ET's , who unfortunately were blindsided by this very radical display from the Anti-humans and missed their opportunity to stop them. So the only thing they could do was to 'rebuild' the sun giving NASA the information on how to keep it going.