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The scarcity of what isotope is a critical test of the density of the present cosmos?
Q16: The concept that the direction of observation
Q18: Why do we believe galaxy clusters are
Q21: String theories, like GUTs, explain how gravity
Q22: Homogeneity and isotropy, taken as assumptions regarding
Q25: A Hubble Constant of <span
Q26: The protons, neutrons, and electrons of our
Q33: Most of the new star formation in
Q37: At the end of the first fifteen
Q65: In an open universe two parallel beams
Q99: Quarks are made up of subatomic particles,