for example, “Pluto was officially discovered in 1930, but astronomers digging through archives since then have found evidence of its discovery going farther back,
The solar system's largest planet, Jupiter, could fit over 1,300 Earths inside it. But Earth isn't the smallest planet in the solar system; that title went to Mercury after Pluto was relegated to a dwarf planet in 2006. But are there even smaller planets out there? And, if so, do ...