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This led him to estimate that Earth was about 75,000 years old. ... USGS preface on the Age of the Earth; NASA exposition on the age of Martian meteorites;
Earth is the third planet from the Sun ... The earliest direct evidence of life on Earth is contained in 3.45 billion-year-old ... a NASA astronaut, observing Earth ...
First full-disk "true color" [41] picture of the Earth; [42] subsequently used on the cover of the first Whole Earth Catalog. [43] [42] December 21, 1968. Apollo 8. First full-disk image of Earth from space taken by a person, probably by astronaut William Anders. [44] December 24, 1968.
Creola Katherine Johnson ( née Coleman; August 26, 1918 – February 24, 2020) was an American mathematician whose calculations of orbital mechanics as a NASA employee were critical to the success of the first and subsequent U.S. crewed spaceflights. [1] [2] During her 33-year career at NASA and its predecessor, she earned a reputation for ...
Schematic of NASA Earth Science Division operating satellite missions as of February 2015. NASA Earth Science is a large, umbrella program comprising a range of terrestrial and space-based collection systems in order to better understand the Earth system and its response to natural and human-caused changes.
UFOs and ufology. The Black Knight satellite conspiracy theory claims that a spacecraft of extraterrestrial origin is in near- polar orbit of the Earth, and that NASA is covering up its existence and origin. [2] [3] This conspiracy theory combines several unrelated stories into one narrative. [4] [5]
Another example is Earth's axial tilt, which, due to friction raised within Earth's mantle by tidal interactions with the Moon , is incomputable from some point between 1.5 and 4.5 billion years from now. The outer planets' orbits are chaotic over longer timescales, with a Lyapunov time in the range of 2–230 million years.
Time in space. 9d 19h 54m [2] Missions. STS-95. Mission insignia. John Herschel Glenn Jr. (July 18, 1921 – December 8, 2016) was an American Marine Corps aviator, astronaut, businessman, and politician. He was the third American in space, and the first American to orbit the Earth, circling it three times in 1962. [3]