Context of Jaw-dropping

Sixty-six years ago, there was a single human-built object in earth orbit: Sputnik, the world’s first satellite. Today, there are 100 trillion objects circling the planet. That’s the jaw-dropping number cited by international researchers in an open letter published March 9 in Science, calling for a global treaty to curb the ever-growing debris belt in low-earth orbit.
—Time

Which of the following BEST interprets the meaning of “jaw-dropping” in the passage?

Related Topic

—The first artificial satellite to enter earths orbit | Video by NBC News

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