Astronaut

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Across
  1. 4. the fourth planet from the Sun
  2. 6. all of space and time and their contents
  3. 9. hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto
  4. 10. a vehicle that uses jet propulsion to accelerate without using the surrounding air
  5. 12. one of the brightest stars in the sky
  6. 13. unsuitable for living in
  7. 16. is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune
  8. 17. a retired, partially reusable low Earth orbital spacecraft system
  9. 19. the third planet from the Sun and the only astronomical object known to harbor life
  10. 20. is a chemical element; it has symbol O and atomic number 8
  11. 21. the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter
  12. 22. is a spacecraft capable of supporting a human crew in orbit for an extended period of time and is therefore a type of space habitat
  13. 25. The smallest planet in our solar system and nearest to the Sun
  14. 26. Uranus is the seventh planet from the Sun. It is a gaseous cyan-coloured ice giant
  15. 27. limitless or endless in space, extent, or size; impossible to measure or calculate.
Down
  1. 1. the second planet from the Sun. It is a rocky planet with the densest atmosphere of all the rocky bodies in the Solar System
  2. 2. is a large, rounded astronomical body that is neither a star nor its remnant
  3. 3. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
  4. 5. a planet that is composed primarily of silicate rocks or metals
  5. 7. he eighth and farthest known planet from the Sun
  6. 8. It is like floating, the feeling you get when a roller coaster suddenly goes down.
  7. 11. is a giant planet composed mainly of hydrogen and helium
  8. 14. an individual who has flown in outer space
  9. 15. a continuous area or expanse which is free, available, or unoccupied.
  10. 17. any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources
  11. 18. the brightest celestial object in Earth's night sky
  12. 23. the star around which the earth orbits.
  13. 24. the force by which a planet or other body draws objects toward its center