Examlex
The age of a star cluster can be approximated by finding its turnoff point in the distribution of data points that represent stars on the H-R Diagram.
Q18: How have astronomers determined the mass of
Q27: Astronomers often record solar images in the
Q28: Which trigger could start the gravitational contraction
Q34: Why do sunspots occur darker than the
Q47: Star B has an apparent visual magnitude
Q49: Most of the energy emitted by a
Q65: An astronomer records the spectrum of light
Q67: A neutral atom must have _.<br>A) an
Q71: Cosmologists cannot begin their history of the
Q73: How have supernovae affected the development of