Potential answers for "___ horizon (black hole boundary)"

⭐⭐⭐⭐ EVENT
⭐⭐⭐ EVENTHORIZON
⭐⭐ ACEIN
⭐⭐ PEGIN
⭐⭐ NEGRO
⭐⭐ INKPOT
⭐⭐ OIL
⭐⭐ QUASAR

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