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Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.
Notable test flights of spaceflight systems may be listed even if they were not planned to reach space. Some lists are further divided into orbital launches (sending a payload into orbit, whether successful or not) and suborbital flights (e.g. ballistic missiles, sounding rockets, experimental spacecraft).
The satellites were subsequently retrieved by Space Shuttle Discovery during mission STS-51-A in November and were returned to Earth for refurbishment. Westar 6 was sold to AsiaSat and renamed AsiaSat 1 , and launched by a Chinese Long March 3 carrier rocket on 7 April 1990.
Space Shuttle Discovery [4] Kennedy LC-39B United Space Alliance STS-56: NASA Low Earth Solar astronomy: 17 April 11:37:19: Successful Spacelab Pallet: ESA/NASA Low Earth (Discovery) Spacelab ATLAS-2: SPARTAN-201: NASA Low Earth (Discovery) Solar Crewed orbital flight with five astronauts; SPARTAN deployed from Discovery on 11 April and ...
2013: Discovery of ultra-long class of gamma-ray bursts; 24 April 2013: Swift detected an X-ray flare from the Galactic Center. This proved not to be related to Sgr A* but to a previously unsuspected magnetar. Later observations by the NuSTAR and the Chandra X-ray Observatory confirmed the detection. [42]
Prepared and isolated from urine, it was the first element whose discovery date and discoverer are recorded. [53] Its name first appears in print in the work of Georg Kaspar Kirchmayer in 1676. Recognised as an element by Lavoisier. [1] 1 Hydrogen: 1671 R. Boyle: 1671 R. Boyle Robert Boyle produced it by reacting iron filings with dilute acid.
The Franklin Institute is a science museum and the center of science education and research in Philadelphia, Pennsylvania. It is named after the American scientist and statesman Benjamin Franklin. It houses the Benjamin Franklin National Memorial. Founded in 1824, the Franklin Institute is one of the oldest centers of science education and ...
STS-109 (SM3B) was a Space Shuttle mission that launched from the Kennedy Space Center on 1 March 2002. It was the 108th mission of the Space Shuttle program, [1] the 27th flight of the orbiter Columbia [1] and the fourth servicing of the Hubble Space Telescope. [2]