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Globular clusters can be used to measure the distance of nearby galaxies.
Q13: NASA's Hubble Deep Field images and GOODS
Q15: What is the correct ordering of galactic
Q17: Elements such as carbon, silicon and oxygen
Q21: Quasars are_.<br>A) spiral galaxies with unusually luminous
Q23: Matter falling into a black hole arranges
Q23: Olber's paradox is explained by the fact
Q41: During the main sequence lifetime of a
Q49: The farthest galaxies that astronomers have seen
Q50: _ are cool, with temperatures of about
Q62: Planetesimals beyond the orbit of _ failed