Susan CartwrightOur Evolving Universe1 Understanding Stars n What do we know? n From observations of nearby stars: l l luminosity/absolute magnitude l.
Susan CartwrightOur Evolving Universe1 The Lives of Stars n From studying nearby stars and stellar clusters l most stars are on the main sequence l stars.
Susan CartwrightOur Evolving Universe1. Susan CartwrightOur Evolving Universe2 l galaxies observation of distant galaxies detailed study of nearby.
Susan CartwrightOur Evolving Universe1 Galaxy evolution n Why do galaxies come in such a wide variety of shapes and sizes? n How are they formed? n How.
Susan CartwrightOur Evolving Universe1 Other galaxies n Telescopic images of the night sky reveal many other galaxies l l What do they look like? are.
Susan CartwrightOur Evolving Universe1 Star Birth n Most of the bright stars we see have lifetimes much less than the age of the Solar System l l star.
Susan CartwrightOur Evolving Universe1 A planet-building universe n The top ten elements: Note that the most common elements in your body all occur in.
