NASAのインスタグラム(nasa) - 7月1日 02時25分

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When an asteroid or comet comes close to Earth we call it a near-Earth object. But how close is close? How do we keep track of them? What can we do to mitigate our risk? We have the answers.⁣⁣⁣
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Here’s what you need to know about near-Earth objects this #AsteroidDay! ⁣⁣⁣
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#SolarSystem #NASA #Asteroid #FunFact #NowYouKnow #Science

[BIHAKUEN]UVシールド(UVShield)

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