The Moon is thought to have formed when an object roughly the size of Mars hit the Earth. The impact was so violent that it threw large amounts of the Earth's mantle into orbit. This material evenually coalesced and formed the Moon.
Ansel Easton Adams was an American photographer and environmentalist. His black-and-white landscape photographs of the American West, especially Yosemite National Park, have been widely reproduced on calendars, posters, and in books.
World War II gave eminence to an extraordinary number of American writers and photographers: John Hersey, Edward R. Murrow, Robert Sherrod, Richard Tregaskis, William Shirer, Quentin Reynolds, Robert Capa and Margaret Bourke-White. The most celebrated of them all was Ernie Pyle.