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What causes a supernova?(1 point) Responses force of gravity force of gravity force of a nebula force of a nebula energy of heat energy of heat energy of a nebula
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How can a planetary nebula be identified? Select the two correct answers.(1 point) Responses spherical shape spherical shape central star remnant central star remnant diffuse edges diffuse edges dark area
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What does it mean to characterize a nebula as diffuse?(1 point) Responses Its edges do not have clear boundaries. Its edges do not have clear boundaries. It reflects only non-visible radiation. It reflects only non-visible radiation. It reflects only visible radiation. It reflects only visible radiation. Its edges have clear boundaries.
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How are nebulae and stars related? Select the three correct answers.(2 points) Responses Stars explode to form nebulae. Stars explode to form nebulae. Nebulae form from stars. Nebulae form from stars. Nebulae explode to form stars. Nebulae explode to form stars. Nebulae are found inside stars. Nebulae are found inside stars. Stars are pulled toward nebulae. Stars are pulled toward nebulae. Stars form from nebulae.
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