A supernova explosion or nearby star probably seeded the protosolar cloud with this isotope, in which case the first generation of planetesimals in our solar system contained plenty of it.

• 我们太阳系的雪线位置，就落在火星轨道与木星轨道之间。雪线将行星系统划分为拥有固态物体但挥发性物质稀少的内行星区，以及富含挥发性物质与冰冷物体的外行星区。