What If on MSN
Aliens just visited Earth. Here’s what happens next
Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...
When people imagine life on other planets, they often picture creatures unlike anything found on Earth. Perhaps they have ...
The nature of space, time and the evolution of life on Earth mean it’s unlikely extraterrestrial life has visited our home planet.
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