Why does got season 7 only have 7 episodes?

Related questions

1. Who really tried to kill Bran Stark?
2. Who is fighting for the Iron Throne?
3. Who is the true heir to the Iron Throne?
4. How did Ned Stark die?
5. Is Season 8 Out For Game of Thrones?
6. Is Jon Snow related to the Dragon Queen?
7. Was the Night King a Targaryen?
8. Who holds the Iron Throne at the end of Game of Thrones?
9. How is Jon Snow a Targaryen?
10. Why did baelish betray Ned?

Tags

1. #season
2. #series
3. #seven
4. #final
5. #which
6. #through
7. #while
8. #episodes
9. #makes
10. #shortest
11. #seasons