From the mysterious bright spots on a Dwarf Planet to the unexplained dimming of a Star 1500 light years away from earth. Here are five space mysteries and discoveries that continue to baffle top scientists. There are about 10^22 stars in the universe. That’s about 10,000 stars for every grain of sand on Earth. Let’s say 5 percent of those stars are similar to our solar system’s sun. That’s 500 billion billion suns out there. (Yep, billion billion is not a typo.) And scientists estimate that 1 in 5 of those suns has an Earth-like planet. Given those numbers, many scientists are confident that there is life to be found beyond Earth. If not, Earth would be a scientific miracle. So if the probability of alien life in the universe is so high, why haven’t we found it yet? In 1950, while working at Los Alamos National Laboratory, physicist Enrico Fermi famously exclaimed to his colleagues over lunch: “Where is everybody?” He had been pondering the surprising lack of evidence of other life outside of our planet. In a universe that had been around for some 14 billion years, and in that time developed more than a billion trillion stars, Fermi reasoned there simply must be other intelligent civilizations out there. So where are they? We still don’t know, and the Fermi paradox has only strengthened with time. Since the 1950s, humans have walked on the moon, sent a probe beyond our solar system, and even sent an electric sports car into orbit around the sun for fun. If we can go from rudimentary wooden tools to these feats of engineering in under a million years, surely there would have been ample opportunity in our 13.8 billion-year-old universe for other civilizations to have progressed to a similar level — and far beyond — already?