Across
- 1. Force that keeps the planets in orbit
- 3. Second name of a Scientist who discovered a comet that is visible from Earth every 75-79 years
- 4. U.S. federal government space program (abbreviation)
- 7. A person who is trained to travel in a spacecraft
- 9. the biggest planet in the solar system
- 10. The first man-made satellite to complete a successful orbit of Earth
- 11. The closest planet to the centre of the solar system
Down
- 2. The name of the first satellite built in India
- 4. A cloud of hydrogen gas and cosmic dust in space
- 5. The star closest to the Earth
- 6. The last words of the Mars Rover: "My battery is getting low and it is getting ________"
- 8. The _____________ belt separates the inner planets from the outer planets