Fire rainbows are the rarest of all naturally occurring atmospheric phenomena. For a fire rainbow to occur, cirrus clouds must be 20,000 feet in the air with the precise amount of ice crystals, and the sun must hit the clouds at 58 degrees. ~Poppet
Lightning in space: A single bolt of lightning is 50 percent longer than the entire Milky Way galaxy.Scientists have observed lightning on Mars and Saturn but didn't know that lightning could occur in the middle of space, with a force equal to a trillion lightning bolts, or to use the proper scientific terms, 50 million tons of electricity. This insane electrical current was discovered near galaxy 3C303 firing a massive jet of electrified matter 150,000 light-years into outer space.
Lightning occurs due to the electrical shift from a negative charge to the positive charge. According to the limits of physics, lightning is the leap of sparks between these two giant masses with different electric field. http://englishkidzone.com/how-does-lightning-occurs/
Catatumbo Lightning - At the point where the Catatumbo River meets Lake Maracaibo in Venezuela, a constant lightning storm illuminates the sky for around 10 hours a night, for almost half the nights out of the year.
Red sprites and blue jets are both atmospheric and electrical phenomena that take place in the upper atmosphere. They take place above normal lightning; Blue jets happen in cone shapes above thunderstorm clouds, and are not related to lightning. They’re blue due to ionised emissions from nitrogen. Red sprites can appear as different shapes and have hanging tendrils. They occur when positive lightning goes from the cloud to the ground.