Space

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Across
  1. 3. / A vehicle intended to be launched into space.
  2. 4. / The force between two contacting surfaces that slide or tend to slide over each other. It always opposes the motion or the tendency of motion of an object.
  3. 6. / A substance, as oil or grease, for lessening friction
  4. 9. / A person trained to pilot, navigate, or participate as a crew member of a spacecraft.
Down
  1. 1. / A device which makes use of air resistance to slow down the motion of an object.
  2. 2. / Made by humans; produced rather than natural.
  3. 5. / A tube-like transporting device which moves by ejecting gases in the direction opposite to its motion.
  4. 7. / Emission of energy in the form of rays or waves.
  5. 8. / The force which pulls an object towards the centre of the Earth by the Earth.