This solar system just doesn't work. According to a new computer simulation, the planets could never have come together in their current configuration. The only explanation is that we once had a fifth gas giant...and it's still out there somewhere.
Sydneysiders can walk around the sun and its planets when a temporary exhibition of our solar system is erected along the city's beaches this weekend. The scale-model of the solar system will begin at Maroubra Beach with the sun, and end with the dwarf planet, Pluto, almost three kilometres away.