Examlex
What can initiate the free-fall contraction of a molecular cloud?
Q2: Before the twentieth century, astronomers lacked knowledge
Q6: Which of the following applies if the
Q11: Why did Einstein say that the cosmological
Q12: Which of the following observations first led
Q14: Galileo used a telescope to observe the
Q38: If you wanted to measure the distance
Q42: Which of the following types of radiation
Q74: As a star begins to form, what
Q78: The rapid fluctuations of quasars show that
Q117: Neutron stars were first discovered in the