In the last decade, there has been an incredible explosion of knowledge about the little binary planet Pluto-Charon, which is poised on the ragged edge of the planetary system.

• 冥王星和卡戎，这对双行星，总是蹒跚地游弋于太阳系的边缘。而在过去的十年里，我们对于它们的了解却有了爆炸性进展。