To infinity and beyond

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Across
  1. 1. What is the second longest river in the world by length?
  2. 5. What is Batman’s most famous alias aside from his real name?
  3. 7. In which city were the 2008 Summer Olympics held?
  4. 8. What is Superman’s Kryptonian birth name?
  5. 9. Which villain is known for breaking Batman’s back in the comics?
  6. 12. Which hero was once a neurosurgeon before becoming the Sorcerer Supreme?
  7. 16. Which Avenger is a master archer with no superpowers?
  8. 18. What element is the basis of all known life on Earth?
  9. 19. What instrument is used to measure atmospheric pressure?
  10. 20. Who was the first human host of the Venom symbiote?
  11. 21. Where is Thor originally from?
  12. 23. What is Spider-Man’s real identity?
Down
  1. 2. Which element has the atomic number 8?
  2. 3. What is the official language of Brazil?
  3. 4. What rare metal is Black Panther's suit made from?
  4. 6. Which former planet was reclassified as a dwarf planet in 2006?
  5. 10. Which superhero is also known as Logan?
  6. 11. What is Captain America's characters real name?
  7. 13. What artifact helped scholars decipher Egyptian hieroglyphs?
  8. 14. Which mountain range runs along the western edge of South America?
  9. 15. What is the capital city of Australia?
  10. 17. What is the full name of the telepathic founder of the X-Men?
  11. 19. Which Avenger is a former Russian spy with the alias Natasha Romanoff?
  12. 22. Baikal What is the deepest freshwater lake in the world?