Outer Space

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Across
  1. 3. A person who is trained to travel in a spacecraft
  2. 4. A luminous sphere of plasma held together by its own gravity
  3. 7. The curved path of a celestial object or spacecraft around a star, planet, or moon
  4. 9. A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter
  5. 10. An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified
Down
  1. 1. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  2. 2. A celestial object consisting of a nucleus of ice and dust and, when near the sun, a "tail" of gas and dust particles pointing away from the sun
  3. 5. A being from another planet
  4. 6. A cylindrical projectile that can be propelled to a great height or distance by the combustion of its contents
  5. 8. A celestial body that orbits a star and is not a satellite