1						2		3			4			5
				6
7
					8									9
			10									11
12
											13
	14				15								16				17
								18
											19
		20

Across 2. COLOUR IS RELATED TO .................... 6. THE OBSERVATION OF CHANGES IN PITCH OF A SOUND EMITTED BY A MOVING OBJECT 7. AN EXAMPLE IS THE SOUTHERN CROSS 8. PROPOSED THE IDEA THAT GRAVITY CAUSED THE PLANETS TO REVOLVE AROUND THE SUN 11. A STAR MADE OF THESE IS VERY, VERY DENSE 12. A METHOD USED TO MEASURE THE DISTANCE TO NEAR STARS 14. TECHNOLOGY DEVELOPED TO OBSERVE CELESTIAL OBJECTS 16. A CLOUD OF DUST AND GAS IN SPACE 18. THE SCIENTIST WHO DEMONSTRATED THAT MASS AND ENERGY ARE INTERCHANGEABLE 19. THESE WAVES ARE COLLECTED BY A SPECIAL TYPE OF TELESCOPE TO LOOK INTO THE FAR REACHES OF SPACE 20. A GROUP OF STARS

Down 1. A NEARBY GALAXY TO THE MILKY WAY 3. VISIBLE LIGHT IS A WAVE BELONGING TO THIS GROUP 4. THIS IS WHAT THE UNIVERSE IS DOING 5. THE TIME FOR EARTH TO COMPLETE ONE REVOLUTION AROUND THE SUN 9. HE DISCOVERED THAT ALL GALAXIES ARE MOVING AWAY FROM US 10. THE FIRST SCIENTIST TO USE A TELESCOPE TO LOOK AT THE NIGHT SKY 13. THE MOST DISTANT OBSERVABLE OBJECT IN THE UNIVERSE 15. AN ADJECTIVE RELATING TO STARS 17. A FORM OF ENERGY EMITTED BY STARS