Until 2015, Pluto, the former ninth planet of the classical solar system, was largely a mystery—a tiny speck 3.6 billion miles from the sun. When NASA's New Horizons spacecraft arrived at the ...

Pluto the not-yet-dwarf planet was discovered on February 18, ... such as an asteroid into a geostationary orbit at Earth’s equator and connect that object and Earth with a cable or structure.

Mercury is notoriously difficult to see from Earth, thanks to its proximity to the Sun. But on July 4, Mercury reaches its ...