Chapter 23-24 hw

Which of the following is NOT a characteristic of a spiral galaxy? Ongoing star formation Appears mostly blue Contains a central bulge, disk, and diffuse extended halo Contains both old and young stars Contains little gas and dust

contains little gas and dust

Which galaxies appear mostly red? Spiral Both Neither Elliptical

elliptical

Which galaxies are likely to contain many M-spectral type stars but no O-spectral type stars? Both Elliptical Neither Spiral

elliptical

Which galaxies are likely to contain only O-spectral type stars? Neither Elliptical Both Spiral

neither

Which of the following is NOT a characteristic of an elliptical galaxy? Ongoing star formation Contains a central bulge and an extended halo Contains mostly red stars Contains little gas and dust Appears whitish and/or red

ongoing star formation

Which galaxies appear mostly blue? Neither Elliptical Spiral Both

spiral

Which galaxies appear to have many young stars? Spiral Elliptical Both Neither

spiral

Which galaxies are likely to contain both O-spectral type stars as well as M-spectral type stars? Spiral Both Elliptical Neither

spiral

Which galaxies contain abundant amounts of gas and dust? Neither Spiral Elliptical Both

spiral

Which galaxies contain old stars? Elliptical Neither Spiral Both

both