Experiment
Wearing a short-sleeved shirt and shorts, an astronaut puts his hand in a glovebox

Astronaut Bill McArthur sets up an experiment inside the Microgravity Science Glovebox on the International Space Station. Image Credit: NASA

      a test or tests that are used to find out or prove something or to see whether an idea is correct



Sentences:
Astronauts perform many science experiments on the International Space Station.

My science class used lima bean seeds in a plant experiment.



More Information:
http://www.nasa.gov/centers/jpl/news/explorer-20060214.html   →
http://www.nasa.gov/mission_pages/station/multimedia/spheres_3satellites.html
http://www.nasa.gov/mission_pages/station/multimedia/Exp10_image_005.html