Astronaut

4. the fourth planet from the Sun
6. all of space and time and their contents
9. hypothetical Neptune-sized planet orbits our Sun in a highly elongated orbit far beyond Pluto
10. a vehicle that uses jet propulsion to accelerate without using the surrounding air
12. one of the brightest stars in the sky
13. unsuitable for living in
16. is a dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune
17. a retired, partially reusable low Earth orbital spacecraft system
19. the third planet from the Sun and the only astronomical object known to harbor life
20. is a chemical element; it has symbol O and atomic number 8
21. the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter
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
25. The smallest planet in our solar system and nearest to the Sun
26. Uranus is the seventh planet from the Sun. It is a gaseous cyan-coloured ice giant
27. limitless or endless in space, extent, or size; impossible to measure or calculate.

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. is a large, rounded astronomical body that is neither a star nor its remnant
3. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
5. a planet that is composed primarily of silicate rocks or metals
7. he eighth and farthest known planet from the Sun
8. It is like floating, the feeling you get when a roller coaster suddenly goes down.
11. is a giant planet composed mainly of hydrogen and helium
14. an individual who has flown in outer space
15. a continuous area or expanse which is free, available, or unoccupied.
17. any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources
18. the brightest celestial object in Earth's night sky
23. the star around which the earth orbits.
24. the force by which a planet or other body draws objects toward its center