Oxygen and methane take bites out of the starlight at characteristic wavelengths which are their ‘spectral fingerprints’. “The problem,” says Loeb, “is that for the first two billion years of life on Earth there was little oxygen in the atmosphere. And both oxygen and methane can have...
a. The achromatic color value of minimum lightness or maximum darkness; the color of objects that absorb nearly all light of all visible wavelengths; one extreme of the neutral gray series, the opposite being white. Although strictly a response to zero stimulation of the retina, the perception ...
a. The achromatic color value of minimum lightness or maximum darkness; the color of objects that absorb nearly all light of all visible wavelengths; one extreme of the neutral gray series, the opposite being white. Although strictly a response to zero stimulation of the retina, the perception ...