Spiral density wave theory and self-sustaining star formation are ways to explain why ____.
a. stars orbit the galaxy with different periods at different distances from the center
b. sun-like stars are evenly distributed through the disk of the galaxy
c. dark matter affects the orbit of stars outside the visible disk of the galaxy
d. molecular clouds are compressed forming young stars along spiral arms
e. the central bulge of the galaxy has a bar shape
Question 2
One of the first tests of the general theory of relativity was the ____.
a. description of the orbit of the moon
b. determination of the speed of light as a constant
c. change in mass of a particle moving at a high speed
d. demonstration of a hammer and a feather falling at the same rate on the moon
e. determination of the rate of advance of the perihelion of Mercury's orbit
Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
The Major Subcortical Connections of the Hippocampal Formation
Pneumonia patient’s chest x-ray. Note the irregular areas of density.
Formation of an Impact Crater
Bone formation in normal mice and mutants for the runt gene Cbfa1