Planet Earth Disc 1

Within the first billion years of Earth’s history, life appeared in the oceans and began to affect the Earth’s atmosphere and surface, leading to the proliferation of anaerobic and, later, aerobic organisms. Some geological evidence indicates that life may have arisen as early as 4. 1 billion years ago. Since then, the combination of Earth’s distance […]

Continue Reading...

NASA Budget Graph 2019

The perceived national security threat posed by early Soviet leads in spaceflight drove NASA’s budget to its peak, both in real inflation-adjusted dollars and in a percentage of the total federal budget (4. 41% in 1966). But the U. S. victory in the Space Race — landing men on the Moon — erased the perceived […]

Continue Reading...
a b c d e f g h i j k l m n o p q r s t u v w x y z