brightness

Because the planet's faint glow is easily lost in the brightness of its host star, researchers applied high-contrast imaging techniques to separate the light of the planet from that of the star.

The glasses allowed them to adjust contrast and brightness and magnify up to 12 times.

Records show that humans have been observing the red monster for millenia, and have even noticed its change in brightness over that time.

Its puzzling variations in brightness have long hinted that two enormous black holes may be orbiting and merging at its center.

CaSSIS could not measure the coma's full extent because its brightness fades rapidly with distance from the nucleus, eventually disappearing into background noise.