What is Event Horizon in black hole?

Related questions

1. What happens if you enter a black hole?
2. What's beyond the observable universe?
3. What's in a black hole?
4. Do wormholes exist?
5. Is there a black hole near Earth?
6. How big is a black hole?
7. What defines an event horizon?
8. Is exotic matter real?
9. Do all black holes have the same density?
10. What does event horizon look like?

Tags

1. #velocity
2. #speed
3. #restricted
4. #described
5. #horizon
6. #particle
7. #often
8. #escape
9. #boundary
10. #direction
11. #event
12. #black
13. #greater
14. #within
15. #which
16. #light