space travel

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Across
  1. 2. to send a rocket or spacecraft into space, usually from the ground
  2. 4. a substance that is burned to create energy, which helps rockets travel into space
  3. 6. a vehicle that can travel into space by pushing itself forward using powerful force
  4. 8. a machine inside a rocket or spacecraft that produces power to make it move
Down
  1. 1. the natural force that pulls objects toward a planet, especially toward the Earth
  2. 3. the curved path that a spacecraft or object follows as it moves around a planet
  3. 5. to bring a spacecraft safely down onto the surface of a planet or moon
  4. 7. a group of people who work together on a spacecraft to control it and complete a mission