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Across 5. Instrument that gathers and focuses visible light to make distant objects appear nearer. 7. an altitude between 200km and 1000km 8. the force that moves a spacecraft forward 9. a permanent building that houses telescopes 10. an instrument used by astronomers to determine the distance to the stars

Down 1. the energy emitted from matter 2. speed needed for a vehicle to overcome the force of Earth's gravity and travel into deep space 3. Faster than the speed of light 4. refers to an orbit in which an object stays in the same position over Earth 6. an unpiloted spacecraft that leaves Earth's orbit