Eric Walker added The sun has blasted Mercury with a plasma wave | Space to Mercury (planet)
Eric Walker added Mercury's 400 C heat may help it make its own ice | EurekAlert! Science News and The sun has blasted Mercury with a plasma wave | Space to Mercury (planet), and added Mercury (planet) to Solar system and Planets
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