Why are photons affected by gravity?

Related questions

1. What is inside a photon?
2. What's inside a photon?
3. Are photons electrons?
4. Is light attracted by gravity?
5. Do photons have color?
6. Can a photon be stopped?
7. Do photons have gravity?
8. Do photons exist?
9. How long can a photon last?
10. Why is light attracted by gravity?

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1. #matter
2. #force
3. #however
4. #physically
5. #these
6. #change
7. #yields
8. #affected
9. #photons
10. #gravity
11. #point
12. #itself
13. #packets
14. #energy
15. #while
16. #momentum
17. #interact
18. #little
19. #first
20. #actual
21. #objects
22. #light