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Across 1. small icy bodies orbiting the sun, usually on a highly elliptical path 4. group of billions of stars 6. flash of light in the sky caused by a particles of dust 7. huge spinning balls of hot luminous gases 8. star at the center of the solar system 10. person who studies the universe 12. study of celestial objects 16. the whole universe including the earth 17. cloud of gas and dust in the space and birth-place of stars. 18. passage of an astronomical body through the shadow of another

Down 2. meteor which falls on earth's surface from space 3. India's first mission to moon by I.S.R.O. 5. rocks between the gap of orbits of mars and jupiter 9. India's first satellite into space in 1975 11. small bodies that orbit a large one,either natural or artificial 13. large celestial bodies in orbit around a star (SUN) 14. the largest planet 15. the closest planet to the earth