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Across 1. what happens when debris forms a ring around a rock or object that is bigger due to gravity 4. a mass of rock that is too small too be a planet 6. the expression used to describe if a planet can contain life 7. a large mass of heat and energy that can also be called a sun

Down 2. a massive hole of immense gravity in space 3. a shape stars make up in the sky 5. the distance light travels in a year