Solar System largely of materials with lower melting points. The boundary in the Solar System beyond which those volatile substances could condense is known as the frost line, and it lies at roughly 5 AU from the Sun. The objects of the inner Solar System are composed mostly of rock, the collective name for compounds with high melting points, such as silicates, iron or nickel, that remained solid under almost all conditions in the protoplanetary nebula. Jupiter and Saturn are composed mainly of gases, the astronomical term for materials with extremely low melting points and high vapour pressure, such as hydrogen, helium,
Twice as Far Twice as Far "Twice as Far" is the fourteenth episode of the sixth season of the post-apocalyptic horror television series "The Walking Dead", which aired on AMC on March 20, 2016. The episode was written by Matthew Negrete and directed by Alrick Riley. This episode primarily focuses on two separate groups of characters going on supply runs; Daryl, Rosita, and Denise; and Abraham and Eugene. The episode marks Merritt Wever's final appearance of supporting character, Dr. Denise Cloyd, as she is killed off in this episode. It also marks the return of Austin Amelio as Dwight, who has been absent