Out at 5 AU, they reach four Earth masses over a few million years.Embryos can grow even bigger near the snow line or on the edges of gaps in the disk, where planetesimals also tend to accumulate.

• 如果距离为5AU，它们可于数百万年内长到4个地球质量，在雪线附近或气盘裂隙边缘的行星胚胎，甚至可以长得更大，因为微行星容易聚集在那里。