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  2. Human spaceflight programs - Wikipedia

    en.wikipedia.org/wiki/Human_spaceflight_programs

    The North American X-15 rocket-powered aircraft was part of the X-series of experimental aircraft, initiated with the Bell X-1, that were made for the USAF, NASA, and the USN. The X-15 set speed and altitude records in the early 1960s, reaching the edge of outer space and returning with valuable data used in aircraft and spacecraft design.

  3. Multistage rocket - Wikipedia

    en.wikipedia.org/wiki/Multistage_rocket

    A multistage rocket or step rocket [1] is a launch vehicle that uses two or more rocket stages, each of which contains its own engines and propellant. A tandem or serial stage is mounted on top of another stage; a parallel stage is attached alongside another stage. The result is effectively two or more rockets stacked on top of or attached next ...

  4. Mercury-Atlas 5 - Wikipedia

    en.wikipedia.org/wiki/Mercury-Atlas_5

    Mercury-Atlas 5 was an American spaceflight of the Mercury program.It was launched on November 29, 1961, with Enos, a chimpanzee, aboard.The craft orbited the Earth twice and splashed down about 200 miles (320 km) south of Bermuda, and Enos became the first primate from the United States and the third great ape to orbit the Earth.

  5. Aerospace engineering - Wikipedia

    en.wikipedia.org/wiki/Aerospace_engineering

    The term is used ironically in the expression "It's not rocket science" to indicate that a task is simple. [27] Strictly speaking, the use of "science" in "rocket science" is a misnomer since science is about understanding the origins, nature, and behavior of the universe; engineering is about using scientific and engineering principles to ...

  6. Two-stage-to-orbit - Wikipedia

    en.wikipedia.org/wiki/Two-stage-to-orbit

    A two-stage-to-orbit (TSTO) or two-stage rocket is a launch vehicle in which two distinct stages provide propulsion consecutively in order to achieve orbital velocity. It is intermediate between a three-stage-to-orbit launcher and a hypothetical single-stage-to-orbit (SSTO) launcher.

  7. Crossword - Wikipedia

    en.wikipedia.org/wiki/Crossword

    A crossword (or crossword puzzle) is a word game consisting of a grid of black and white squares, into which solvers enter words or phrases ("entries") crossing each other horizontally ("across") and vertically ("down") according to a set of clues. Each white square is typically filled with one letter, while the black squares are used to ...

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Aircraft engine - Wikipedia

    en.wikipedia.org/wiki/Aircraft_engine

    A rocket turbine engine is a combination of two types of propulsion engines: a liquid-propellant rocket and a turbine jet engine. Its power-to-weight ratio is a little higher than a regular jet engine, and works at higher altitudes.