Io is very close to the Sun. Io was formed later than the other Galilean satellites, so it hasn't finished cooling yet. Stars like the Sun probably do not form iron cores during their evolution because a. all the iron is ejected when they become planetary nebulae. Stars have dark lines in their spectra because a. the cooler atoms in their surface layers absorb the radiation at some wavelengths . The statement is false.
Stars have bright emission lines in their spectra, but no absorption lines.
Meteor showers such as the Perseids in August are caused by a. the breakup of asteroids that hit our atmosphere at predictable times. A large belt containing asteroids in a gap between the orbits of Mars and Jupiter. A disklike swarm of icy objects that lies just beyond the orbit of Neptune. A swarm of comet nuclei in a huge shell surrounding the Sun and planets d. An enormous aggregate of gas and dust from which the Solar System was formed.