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Across 4. An object located out of the earths atmosphere like the moon 5. A type of galaxy that has an ellipisodial shape 6. A vast area with a collection of planets and stars and is held together by gravity 9. A gravitational trajectory for example our solar system 13. A change in the atomic nucleus when there is alot of energetic particles 14. A model that shows the cycle of something, for examplea stars life cycle 15. A ball of gas held together by gravity for example our sun 16. A thermometer unit equal to Celsius 17. A type of galaxy with an irregular shape

Down 1. A scatter plot whihch xplains stars luminosity 2. The number of atoms in an object 3. A group where a star is classified based upon its brightness and mass 7. The brightness of an object in space 8. The galaxy that our solar system is located in 10. A unit in order to measure the thermal energy of an object 11. Plural of nebula which is a massive cloud of gas and dust in space 12. All existing matter as a whole it is said to also be expanding