Researchers have shown that population density associates with the brightness of urban landscapes in nighttime imagery.Annotate version of the photo.As the Sun dips listed below the curvature of Earth, the differing layers of the environment appear as different colors in this oblique picture of Earths limb. It is supplied by the ISS Crew Earth Observations Facility and the Earth Science and Remote Sensing Unit, Johnson Space. Extra images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth.
