... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... White dwarfs could be fertile ground for other earths . Potentially habitable planets orbiting white dwarfs could be much easier to find, if they exist, than other exoplanets located so far away. ... A planet so close to its star could be observed using an Earth-based telescope, as small as 3.2 feet (1 meter) across, as the planet passes in front of and dims the light from the white dwarf, he said. White dwarfs evolve from stars like the Sun. ...