What system do astronomers rely on to gauge the remoteness of distant objects?
Answer
The cosmic distance ladder.
To map the vast scale of the universe, astronomers employ a hierarchical set of interlocking measurement techniques collectively referred to as the cosmic distance ladder. This methodology involves measuring distances incrementally, where the calibration for one rung relies on the accuracy achieved by the preceding, closer rung. This system is essential because no single technique can effectively measure distances across the entire range of cosmic scales, requiring successive reliance on methods like parallax for nearby stars to calibrate standard candles used for more distant galaxies.
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