SPACE AND PLANETS

2. HOLE An object with such strong gravity that nothing, not even light, can escape from it
4. Fifth planet from the sun, also known as the Gas Giant
5. An explosion that occurs when a star has reached the end of its life
7. Seventh planet from the sun, also known as the Ice Giant
9. Private space exploration company founded by Elon Musk
10. A person trained to travel in a spacecraft
11. Fourth planet from the sun, also known as the Red Planet
14. The path an object takes as it revolves around another object
15. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
16. An interstellar cloud of gas and dust
18. A small rocky body orbiting the sun

1. National Aeronautics and Space Administration, the United States government agency responsible for the space program
3. Second planet from the sun, also known as the Morning or Evening Star
5. An object that orbits a planet or other celestial body
6. Third planet from the sun, the only known planet with life
8. Sixth planet from the sun, also known for its prominent rings
12. SYSTEM The collection of eight planets and their moons in orbit around the sun
13. A vehicle designed for travel or operation outside Earth's atmosphere
15. Italian astronomer who discovered the four largest moons of Jupiter
17. A celestial object consisting of a nucleus of ice and dust