Relating to the measurement of light and brightness from stars and celestial objects using specialized instruments.
Adjective form of astrophotometry, combining astro- + photometrical. The -ical suffix makes it an adjective describing things related to astrophotometric measurement.
Astrophotometrical studies of distant supernovas allowed scientists to realize the universe was expanding and accelerating—one of the biggest physics discoveries of the 20th century, earned with a Nobel Prize!
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