1) how can astronomers determine the chemical composition of stars? a) by measuring their temperature and brightness b) by analyzing their emission and absorption c) by capturing charged particles traveling through space d) by detecting the star's gravitational force 2) all objects emit radiation as a result of a) an increasing number of charged particles forming within the object b) charged particles being accelerated c) the growing temperature of charged particles within the object d) releasing tension built by charged particles within the object 3) what are the main components of the milky way? a) nebula, arms, and bulge b) disk, bulge, and halo c) disk, center, and cluster d) halo, nova, and dust 4) what is the main difference between the atmospheres of jupiter and neptune? a) jupiter has methane clouds b) neptune has methane clouds c) jupiter does not have hydrogen and helium d) neptune does not have hydrogen and helium 5) the techniques used to find exosolar planets are based on a) radioactive waves b) microwave background waves c) detected collisions d) an analysis of light