 Hello, and welcome to our 2018 review. 2018 again was another big year. It's exciting to be living in a time of great discover. We'll start out in the solar system with a look at the northern lights on Saturn. We also had another landing on an asteroid. This time, an asteroid quite close to the Earth. Going outside the solar system, we'll take a look at the ghost of Cassiopeia. We'll take a closer look at the stars at the center of our galaxy. And we had the second data release from Gaia. It covered 1.7 billion stars and created parallax information that will be used over the next decade to recalibrate our entire distance ladder from parallax to redshift. Going outside the galaxy, we'll take a look at a wide variety of galaxies and galaxy clusters. We'll see a star that existed 9 billion light years away. We'll also take a deep dive into brown dwarfs. What they are, how do they form, where do they fit between low mass stars and high mass planets? We'll even look at electron pressure and how, as we add mass to a gas giant planet, it can actually cause it to shrink instead of get bigger. But first, we'll start with Saturn.