The last stage in the evolutionary track of a star depends upon the star’s mass. discuss the various possible ending stage of stars and relate the cause of the outcome of each to their mass.

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

What is one early technological advance that shaped culture? a the use of fire b the discovery of arable land c family units. d migration

How does lithosphere behave as a system ?