The Pioneer Plaque

While unlikely that Pioneer 10 will reach another civilization, NASA (mainly Carl Sagan and Frank Drake) provided Pioneer 10 with a plaque that would hopefully tell another intelligent civilization about our own civilization on Earth.

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Pluto the Dwarf Planet

Many of us remember Pluto as the used-to-be 9th planet in our solar system that was demoted to a dwarf planet. So what makes Pluto a dwarf planet and not a planet? What is interesting about Pluto, and, if it was so small, how exactly was it discovered earlier than other dwarf planets?

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