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How are the properties of the densest parts of the interstellar medium measured?
Q1: Two comets approach the Sun with the
Q5: Arrange the following events in order,from soonest
Q18: If a star is so large that
Q37: Self-replicating molecules:<br>A) can create copies of themselves.<br>B)
Q39: An asteroid follows a highly elliptical orbit
Q47: An exoplanet orbits its star on a
Q51: Which component contains most of the mass
Q56: General managers bear responsibility for specific departments
Q69: The ion tail of a comet points:<br>A)
Q69: Which of the following questions can the