Astronomy
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Astronomers / Cosmologists
Outer space - Wikipedia, the free encyclopedia
The boundaries between the Earth's surface and outer space, at the Kármán line , 100 km (62 mi) and exosphere at 690 km (430 mi). Not to scale Outer space , or simply space , is the void that exists between celestial bodies , including the Earth . It is not completely empty, but consists of a hard vacuum containing a low density of particles: predominantly a plasma of hydrogen and helium , as well as electromagnetic radiation , magnetic fields , and neutrinos . Theory suggests that it also contains dark matter and dark energy .
99942 Apophis ( / ə ˈ p ɒ f ɪ s / , previously known by its provisional designation 2004 MN 4 ) is a near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a small probability (up to 2.7%) that it would strike the Earth in 2029. Additional observations provided improved predictions that eliminated the possibility of an impact on Earth or the Moon in 2029. However, a possibility remained that during the 2029 close encounter with Earth, Apophis would pass through a gravitational keyhole , a precise region in space no more than about a half-mile wide, [ 7 ] that would set up a future impact on April 13, 2036. This possibility kept the asteroid at Level 1 on the Torino impact hazard scale until August 2006, when the probability that Apophis will pass through the keyhole was determined to be very small.
99942 Apophis - Wikipedia, the free encyclopedia
The Arecibo Observatory is a radio telescope near the city of Arecibo in Puerto Rico . It is operated by SRI International under cooperative agreement with the National Science Foundation . [ 2 ] [ 3 ] The observatory is also called the National Astronomy and Ionosphere Center , although "NAIC" refers to both the observatory and the staff that operate it. [ 4 ] The observatory's 305 m (1,000 ft) radio telescope is the largest single-aperture telescope ( cf. multiple aperture telescope ) ever constructed.
Arecibo Observatory - Wikipedia, the free encyclopedia
Astronauts / Cosmonauts
NASA - Wikipedia, the free encyclopedia
Coordinates : 38°52′59″N 77°0′59″W / 38.88306°N 77.01639°W / 38.88306; -77.01639 The National Aeronautics and Space Administration ( NASA ) is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research. Since February 2006, NASA's mission statement has been to "pioneer the future in space exploration , scientific discovery and aeronautics research." [ 5 ] On September 14, 2011, NASA announced that it had selected the design of a new Space Launch System that it said would take the agency's astronauts farther into space than ever before and provide the cornerstone for future human space exploration efforts by the U.S. [ 6 ] [ 7 ] [ 8 ]
Nibiru has been linked to NASA, and is also sometimes referred to or confused with Planet X, another supposed world for which there is no evidence.
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