Because the chondritic asteroids formed after the chondrules did, the initial 26Al to 27Al ratio in chondrules places an upper limit on the amount of 26Al that was available to heat the rocky bodies.

• 因为球粒陨石小行星是在球粒之后形成，球粒中铝26对铝27的初始比值，决定了能够用来加热石质天体的铝26含量的上限。