NASA Uses Earth as Laboratory to Study Distant Worlds


These images show the sunlit side of Earth in 10 different wavelengths of light that fall within the infrared, visible and ultraviolet ranges; the images are representational-color, because not all of these wavelengths are visible to the human eye.

A new study uses Earth as a stand-in for an exoplanet and shows that even with very little light — as little as one pixel — it is still possible to measure key characteristics of distant worlds.