Killer asteroids
説明を見る前に、覚えていることを数語で書いてください。個人情報は含めないでください。
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解説を表示
No known significant threat is a qualified claim: it refers to what is known and what counts as significant in that report. It does not mean every object has been discovered or that every possible future impact is ruled out. Read the surrounding time frame and assessment.
Space agencies confirm no known significant asteroid threat for the next hundred years.