Mega Man V (Game Boy) weak to specific weapon, the player is encouraged to complete some stages before others. These bosses are known in game as "Mercury", "Venus", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", and "Pluto", named after the first, second, fourth, and fifth through eighth planets in our Solar System. Pluto was, at the time the game was made, considered a planet, unlike from 2006 and onwards. Terra is named for the Latin word for Earth. Defeating some bosses will allow the player to access Mega Man's robot dog Rush, who can transform into useful "Coil" and "Jet" modes for easier stage navigation. "Mega Man
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,