space exploration

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Across
  1. 1. to send sth such as a spacecraft , weapon, etc. into space, into the sky or through water.
  2. 3. the force that make things fall to the ground when they are dropped.
  3. 7. the guidance of ships or airplanes from place to place.
  4. 8. the Milky Way.
Down
  1. 2. a person who is trained for travelling in a spacecraft.
  2. 4. connected with creatures from another space.
  3. 5. a colourless gas that exists in large quantities in the air which is needed for all creatures on earth.
  4. 6. the part of a spacecraft in which people travel and that often separates from the main rocket.