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Across 3. ________ star clusters are large groupings of older stars 4. large cloud of dust and gas 7. _______ are small comet-like bodies that are the building blocks of planets 9. ______ ______ is matter that does not give off electromagnetic radiation (2 Words) 11. cosmic background ______ is the leftover energy from the big bang 15. type of galaxy that does not have a regular shape 18. a _______ nebula id a glowing cloud of gas that is created from the outer layers of a red giant 19. ______ are spinning neutron stars 22. all of space and everything in it 23. a _______ star system occurs when one star blocks light from another star

Down 1. ______ ______ is a mysterious force that is causing the expansion of the universe to accelerate (2 Words) 2. the blue-white core of a star that is left behind after its outer layers have exploded (2 Words) 5. type of galaxy that have shapes that are round or oval 6. the ____ ____ is a theory that explains that the universe began with a huge explosion (2 Words) 8. _____ _____ are the remains of high mass stars (2 Words) 10. the brilliant explosion of a dying supergiant star 12. distant enormously bright objects that look almost like stars 13. contracting cloud of dust and gas with enough mass to form a star 14. huge group of single stars 16. ______ stars are star systems made of two stars 17. a _____ _____ is an object with gravity so strong that nothing can escape (2 Words) 20. type of galaxy that bulge in the middle and that have arms that spiral outward 21. _____ star clusters have a loose disorganized appearance