Atmosphere of Earth sublimated into polar-mesospheric noctilucent clouds. These are the highest clouds in the atmosphere and may be visible to the naked eye if sunlight reflects off them about an hour or two after sunset or a similar length of time before sunrise. They are most readily visible when the Sun is around 4 to 16 degrees below the horizon. Lightning-induced discharges known as transient luminous events (TLEs) occasionally form in the mesosphere above tropospheric thunderclouds. The mesosphere is also the layer where most meteors burn up upon atmospheric entrance. It is too high above Earth to be accessible to jet-powered aircraft
The World We Live In (Life magazine) The World We Live In (Life magazine) The World We Live In appeared in the pages of LIFE magazine from December 8, 1952, to December 20, 1954. A science series, it comprised 13 chapters published on an average of every eight weeks. Written by Lincoln Barnett, "The World We Live In" spanned a diverse range of topics concerning planet Earth and universe, and employed the talents of countless artists and photographers. These included, among others, cameramen Alfred Eisenstaedt and Fritz Goro, and artists Rudolph Zallinger and Chesley Bonestell. "The World We Live In" was introduced to Life's readership as "the