The region above earth
April 30th, 2010 by Landon
The region above earth is, in a way, becoming a dump. Scientists estimate that 10,000 to 15,000 large pieces of. Junk are orbiting our planet. The space junk includes burned-out rocket engines, old fuel tanks, satellites that have stopped working, and parts of exploded rockets. Most pieces hurtle along at about 6 miles a second, (9.5km/s).
Space trash has already fallen to earth. Most of it has landed in the oceans or on open land, away from the cities. Scientists are working on various ways to clean up the litter while it is still orbiting in space. One suggestion: a satellite that would function as a trash "truck". A space shuttle would carry it into orbit. There, the satellite would track trash and collect it with robot arms. The shuttle would then bring the satellite — and its trash — back to earth.
Where space trash might land is only one problem. Scientists worry more about a greater danger: collisions in orbit between spacecraft and trash. Cleaning up space trash would make space travel safer for satellites — and for astronauts.
On July 20, 1969, two American astronauts planted the first human footsteps on the moon. The man who took the first step was Neil A. Armstrong, the 38- year-old civilian commander of the Apollo 11. As he reached the bottom of the landing craft's ladder and extended his booted left foot to touch the moon's powdery surface, he said: "That's one small step for a man, one giant leap for mankind.
He was followed down the ladder minutes later by Edwin B. Aldrin, , a 39-year-old Air Force colonel. For 2 hours and 21 minutes, the two men wandered about on the barren, rock-strewn moon surface. They tested their ability to move about on this strange world. They took photographs of the landscapes. They set up scientific experiments and collected rock and soil samples. They set up a television camera so the whole world could watch. All the while, the third member of the crew, Michael Collins, 38 , an Air Force lieutenant colonel , piloted the Command Ship in lunar orbit 70 miles above the surface, waiting for the two explorers to rejoin him for the trip back to earth. Altogether, the visit to the moon lasted 21 hours and 37 minutes. Through television and radio, hundreds of millions of people followed the activities aboard Columbia, the Command Ship, and Eagle, the landing craft.
Though the mission was completed almost without flaw, it was filled with suspense and anxiety. The astronauts faced risks on the moon never before met by man. And, as with all space flights, chances of failure and disaster were ever present. An error or failure of any of the millions or individual parts anywhere along the way could have ended the mission short of the goal. An equipment failure or accident on the moon could have left the astronauts stranded.
But they made it. After eight days in space, they splashed down in the Pacific to a presidential greeting aboard the recovery carrier, the U. S. A hornet. They were the heroes of the nation and the world. It was a journey that took man beyond the earth to walk on another world.
copyright: Salecartier.com is an online Jewelry Store . From basics to classics, a unique classic Cartier Jewelry is the perfect gift for that special someone in your life .