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Question Stats:
45% (02:00) correct 55% (02:14) wrong based on 681 sessionsOFFICIAL EXPLANATION
Conclusion
Comets don't have their own light but reflect it from other light sources. A comet's mass is estimated by its brightness. Greater the mass - more light it would reflect off of itself. New revelation by the satellite probe: Haley's comet's material is composed of material which reflects the light many times LESS per unit mass than was previously thought.
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