An asteroid just flew closer than GPS satellites — and we only spotted it hours before it arrived
Asteroid 2025 SU4, about 2 meters wide, passed Earth at just 20,000 kilometers away
It posed no threat, but its last-minute discovery reveals how many space rocks could be lurking nearby
Is Earth prepared for the next one?
Watch this to find out why this tiny visitor is a big wake-up call for planetary defense
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