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Across 3. Energy Used is measured in 5. Closest star to our solar system aside from the sun (2 Words) 12. Planet between Mars and Saturn 16. A/C stands for (2 Words) 18. A mini-planet or planetoid that orbits the sun 19. An example of direct current is 21. Massive, luminous balls of reacting gas 23. Red Light has a ________ wavelength than Blue Light 24. Voltage is the ___________ of electrons and is measured in volts

Down 1. The most distant object in the universe 2. The part of a photocell where there is an absence of free electrons is _________ type 4. The doppler effect can be observed in sound waves and ____________ waves 6. A disadvantage of photocells is that it will not produce electricity when it is dark or _________. 7. A photocell is made up of two pieces of this joined together. 8. Useful Energy Output(x100)/Total Energy Input = 9. The red shift occurs because of this (2 Words) 10. The theory that the universe 'spontaneously burst into existence' is referred to as. (3 Words) 11. The name for the area between the two layers in a photocell is called the ________________ (2 Words) 13. A Planetary nebula will become a _____________ in the next stage of its life cycle (2 Words) 14. Changes light into electricity 15. A Red Supergiant will become a ______________ in the next stage of its life cycle 17. The __________________ suggests that distant galaxies are moving away from Earth (2 Words) 20. ________ = Power x Time 22. Current is the measured in