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Astronomers have learned lots about the universe − but how do they study astronomical objects too distant to visit?

  • Written by Luke Keller, Professor of Physics and Astronomy, Ithaca College
Astronomers have learned lots about the universe − but how do they study astronomical objects too distant to visit?Telescopes at the Cerro Tololo Inter-American Observatory near La Serena, Chile.Guillaume Doyen/CTIO/NOIRLab/NSF/AURA, CC BY

NASA’s OSIRIS-REx spacecraft flew by Earth on Sept. 24, 2023, dropping off its sample of dust and pebbles gathered from the surface of near-Earth asteroid Bennu.

Analysis of this sample will help scientists understand...

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