Finding out about our galaxy has been a powerful human desire since time immemorial. Yet we still have much more to learn about just our own planetary system and Sun. Pluto, for example, is between 2.66 and 4.67 billion miles distant from us, depending on its orbital position. And even today, we are still unraveling this celestial body’s secrets.
It was an American, Percival Lowell, born in 1855, who first posited the existence of a planet beyond Uranus and Neptune. A wealthy businessman with a burning interest in astronomy, he spent the last years of his life, from 1906 until his death in 1916, searching for concrete evidence that what he called Planet X existed.