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Across 1. 97% percent of my atmosphere is made of this ? 3. I have an atmosphere similar to Earth's ? 4. I am the largest ocean in Earth ? 6. I discovered Jupiter's four largest moons ? 7. I was the first probe to go to Mercury ? 11. I cover one fifth of the Earth surface ? 15. How long is a day on Mercury ? 17. I found out that one particular comet comes around every 75 years ? 19. I am the Largest volcano in Our solar System ? 21. I am the largest peak on Earth ? 22. I am often called the baby bear planet ? 23. The average on Venus is ? 24. I am believed to be a fallen star ?

Down 2. In this process I create Helium which generates energy ? 3. I am the biggest storm in our solar system ? 5. When I release these huge burdens of gas I destroy satellites 8. I am a large volcano in Venus ? 9. All the gas giants including Earth have this ? 10. I am the largest moon in the solar system ? 12. I am a heavily cratered moon ? 13. On Mercury how long is a year ? 14. I contain comets from which Halley's comet came from ? 16. I am the Roman Goddess of Beauty ? 18. My two moons are captured ? 20. I am the closest planet to the sun ? 21. I am the Roman God of War ?