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Leap Day is coming. Marvin Samuel Tolentino Pineda/iStock, via Getty images

Why does a leap year have 366 days?

Humans have synced their calendars to the sun and moon for centuries, but every so often, these systems need a little correction.
Didymos (bottom right) and its smaller moonlet Dimorphos (center) were the targets of the Double Asteroid Redirection Test. NASA/Johns Hopkins APL

NASA crashed a spacecraft into an asteroid – photos show the last moments of the successful DART mission

The Double Asteroid Redirection Test successfully showed that it is possible to crash a spacecraft into a small asteroid. Whether the approach could save Earth from a future threat remains to be seen.
A giant asteroid struck Earth and wiped out the dinosaurs 65 million years ago. Mark Garlick/Science Photo Library via Getty Images

An asteroid impact could wipe out an entire city – a space security expert explains NASA’s plans to prevent a potential catastrophe

NASA has only mapped 40% of the potentially dangerous asteroids that could crash into Earth. New projects will boost that number, and upcoming missions will test tech that could prevent collisions.

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