"Mars: Easy Crossword Puzzle": HTML5 Crossword

Across

4. The first spacecraft to reach Mars (7,0,0)
8. The two small moons of Mars (6,3,6,0,0)
11. The largest canyon system on Mars (6,0,0)
12. The largest volcano on Mars (7,0,0)
13. The Roman god of war, after whom Mars is named (4,0,0)

Down

1. The closest point in Mars' orbit to the Sun (10,0,0)
2. The thin layer of atmosphere on Mars (6,0,0)
3. The spacecraft that discovered evidence of liquid water on Mars (4,7)
4. The first successful Mars orbiter (4,6,8,0,0)
5. The agency that successfully landed InSight on Mars (4,0,0)
6. The number of moons orbiting Mars (3,0,0)
7. The person who discovered Mars with a telescope (7,0,0)
9. The Martian day, equivalent to 24.6 Earth hours (3,0,0)
10. The iron oxide that gives Mars its reddish color (4,0,0)
11. The first successful mission to Mars (6,0,0)