Across
- 2. M13 cluster is in which constellation (8)
- 4. First Indian artificial satellite (9)
- 8. A meteor shower is a basically debris left behind by (5)
- 11. First person to suggest heliocentric theory (10)
- 13. Large Hadron Collider is located here (11)
- 15. The first spacecraft to successfully land on Mars (6)
- 16. In GMT, G stands for (9)
- 18. Number of waves per second (9)
- 19. In PSLV, P stands for (5)
- 20. Largest asteroid of our solar system (5)
Down
- 1. Closest planet to the Sun (7)
- 3. From India, passes Tropic of (6)
- 5. The fraction of light that a surface reflects (6)
- 6. Brightest star of Scorpius constellation (7)
- 7. Largest Moon of planet Saturn (5)
- 9. Path of the Sun in the sky as seen from Earth (8)
- 10. In Solar Eclipse, this object comes between Sun and Earth (4)
- 12. Great Red Spot is a cyclone on (7)
- 14. The nearest major galaxy to the Milky Way (9)
- 17. Armstrong and Aldrin boarded Apollo 11's lunar module, named as (5)