What is this close-up picture? (WotsThat: Stretched balloon)

Question

What object is shown in this zoomed-in close-up photo?

ZirconBlade · Accepted Answer

Stretched balloon. Balloons can stretch to incredible sizes before popping because rubber is an elastomer, meaning it can return to its original shape after being stretched. The latex material can expand to several times its resting size while maintaining its structural integrity.

Answer: Stretched balloon

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