astronaut, A person trained to travel in space; Example: The _____ prepared for a mission to Mars, cosmonaut, A space traveler, especially from Russia; Example: The _____ spent months aboard the station, asteroid, A small rocky object orbiting the Sun; Example: Scientists tracked the _____ near Earth, celestial, Relating to the sky or outer space; Example: Telescopes observe _____ bodies every night, galaxy, A huge system of stars, gas, and dust; Example: Our solar system is part of the __________ called the Milky Way., gravity, The force that pulls objects toward each other; Example: Without __________, objects would float freely in space., land, the solid part of the Earth’s surface (not water); Example: After weeks at sea, they were happy to see __________., Universe, All of space and everything in it; Example: Scientists study how the _____ began, launch rocket, To send a rocket into space; Example: They plan to __________ early in the morning., lunar, Relating to the Moon; Example: The mission aims to explore the __________ surface., meteor, A space rock that burns in Earth's atmosphere; Example: We saw a bright __________ in the night sky., rover, A vehicle designed to explore a planet or moon; Example: The __________ collected soil samples on Mars., satellite, An object that moves around a planet, natural or artificial; Example: The __________ sends signals back to Earth., space debris, Broken parts left in orbit around Earth; Example: __________ can damage working satellites if it crashes into them., space tourism, Travel into space for non-professional visitors; Example: Companies hope _____ will become more common, spacecraft, A vehicle made for travel in space; Example: The _____ entered orbit after launch, take off, To leave the ground and begin flying; Example: The rocket will __________ in a few minutes., terrestrial, Relating to Earth or land; Example: Scientists compare __________ and space environments.

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