What If on MSN
What really happened after the dinosaurs went extinct?
Sixty-six million years ago, an asteroid as big as Mount Everest was headed on a deadly collision course with Earth. The ...
What If on MSN
Imagine if Halley’s comet crashed into the moon
There’s a giant, peanut-shaped object orbiting the Sun, and it’s name is Halley’s comet. Like all comets, it’s a cosmic ...
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