Space shuttle: A vehicle or machine designed specifically for operations outside Earth's atmosphere, especially in outer space.
International Space Station: A space station placed in low Earth orbit.
Mars Exploration Program: A long-term initiative initiated by NASA, funded and managed by NASA, with the goal of exploring the planet Mars.
Lunar Mission: A project involving sending a rover or spacecraft developed with national technologies to the lunar surface.
Hubble Space Telescope: A space telescope transported into orbit around Earth by the Space Shuttle Discovery during the STS-31 mission in April 1990.
InSight Mars Lander: A robotic lander designed to explore the deep interior of the planet Mars.
Exoplanet: A planet located outside our solar system.
Space debris: Unused or defunct space vehicles or leftover fragments from space vehicles that continue to orbit in space.
Zero gravity: Weightlessness or the absence of gravity.
Near-Earth Object: Celestial objects that have orbits bringing them close to Earth, typically within 1.3 astronomical units, and have the potential to come into close proximity to our planet.
