1. AIR GLOW

2. PIN HOLE DIFFRACTION

3. RADIO TELESCOPE

4. ARECIBO RADIO OBSERVATORY

5. VLA SICORRO, NM

6. ALMA ATACAMA MILLIMETER ARRAY

7. PALOMAR 200” HALE TELESCOPE

8. LARGE BINARY TELESCOPE

9. VLT

10. ALMA ATACAMA MILLIMETER ARRAY

11. SEGMENTED MIRROR

12. GRAND CANARY TELESCOPE

13. THIRTY METER TELESCOPE

14. EXTREMELY LARGE TELESCOPE

15. LARGE TELESCOPE APERTURES

16. COMPTON GAMMA RAY OBSERVATORY

17. HUBBLE SPACE TELESCOPE

18. CHANDRA X-RAY TELESCOPE

19. GRAZING INCIDENCE MIRROR

20. SPITZER INFRARED TELESCOPE

21. JAMES WEBB TELESCOPE

23. JAMES WEBB SEGMENTED MIRROR

24. LAGRANGIAN POINTS