Terra: The Nature of Our World Terra: The Nature of Our World LifeOnTERRA ("TERRA: The Nature of Our World"), now in its tenth season, is the award-winning science and natural history podcast series that explores the natural connections that propel life on Earth. Overseen by graduate students in the MFA program in Science and Natural History Filmmaking at Montana State University, LifeOnTERRA distributes independently produced science, nature, cultural, and environmental films. The content of these podcasts are contributed by numerous independent filmmakers, lending their talent and voices to issues concerning life here on planet earth. Our World. Your Stories. The site provides a full archive of
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,