Eric Walker added James Webb Space Telescope's 1st year in space has blown astronomers away | Space to a number of topics
Eric Walker added What Would You See If You Fell Into Neptune? (4K UHD) - YouTube to Neptune (planet)
Eric Walker added a number of topics and a number of links to Solar system, and added Solar system to Milky Way and Star systems
Eric Walker added a number of topics and Planetary Collisions Can Drop the Internal Pressures in Planets | www.caltech.edu and Radioactive elements may be crucial to the habitability of rocky planets to Planets, and added Planets to Outer space