Summary:

- Astronomers have discovered a key factor that limits the formation of "super-Earths" - planets larger than Earth but smaller than Neptune. This discovery provides important insights into the formation and evolution of planetary systems.

- The study found that the amount of dust available in the protoplanetary disk around a young star is a critical factor in determining whether super-Earths can form. If there is not enough dust, the growth of planetary cores is stunted, preventing the formation of super-Earths.

- This finding helps explain the observed rarity of super-Earths in the universe and suggests that the conditions required for their formation are more specific than previously thought. It also has implications for understanding the diversity of planetary systems and the processes that shape their development.