heptane. n. 1. (Elements & Compounds) an alkane existing in nine isomeric forms, esp the isomer with a straight chain of carbon atoms (n-heptane), which is found in petroleum and used as an anaesthetic. Formula: C7H16. [C19: from hepta- + -ane, so called because it has seven carbon atoms].
technically it's not any of those three... After the Apollo program in the late 1960's ended, the president of the United States, Richard Nixon declared in 1973 that the USA would build the Space Shuttle to continue space exploration in low earth orbit.
Image above: Space shuttle Atlantis launches July 8, 2011 on the STS-135 mission, the final flight of the Space Shuttle Program.Image credit: NASA âº View larger image.pace shuttle Atlantis completed the program on July 21, 2011, wrapping up the STS-135 mission with a predawn touchdown on the same runway where Columbia first arrived more than 30 years earlier.