Atmosphere of Earth and balloons, and too low to permit orbital spacecraft. The mesosphere is mainly accessed by sounding rockets and rocket-powered aircraft. The stratosphere is the second-lowest layer of Earth's atmosphere. It lies above the troposphere and is separated from it by the tropopause. This layer extends from the top of the troposphere at roughly above Earth's surface to the stratopause at an altitude of about . The atmospheric pressure at the top of the stratosphere is roughly 1/1000 the pressure at sea level. It contains the ozone layer, which is the part of Earth's atmosphere that contains relatively high concentrations of
The World We Live In (Life magazine) and Joiners of America to contribute $75,000 in memory of W. L. Hutcheson". The forest was renamed the Hutcheson Memorial Forest. Paleontologist Bob Bakker mentions Zallinger's dinosaurs as the spark that ignited his passion for prehistory; ironically, Bakker himself would later argue against Zallinger's rendition. George Olshevsky also cites "The World We Live In" as introducing him to science, and adds that he suggested authoring an updated version; however, "Life"'s editors were not interested. "The World We Live In "was also the basis for a science series by the German comic book Mosaik. "The World We Live In" was followed