The formation of planets is a complex process that is still not fully understood. However, it is thought that planets begin as small dust grains that collide and stick together to form larger and larger objects. Eventually, these objects become so large that they are able to pull in more and more material, growing into planets.

The first step in planet formation is the creation of these small dust grains. These grains are thought to form in the outflows of young stars. As the star forms, it ejects a stream of gas and dust into space. This material cools and condenses into small particles, which can then collide and stick together to form larger grains.

The size of these dust grains is important for planet formation. Grains that are too small will not be able to stick together effectively, while grains that are too large will be difficult to pull together by gravity. The ideal size for planet-forming dust grains is thought to be around 100 microns.

Recent observations have shown that there are large dust grains present in star-forming regions. These observations provide evidence that the first step in planet formation may be occurring. The presence of large dust grains in star-forming regions suggests that the conditions are right for the formation of planets.

Further research is needed to understand the role that large dust grains play in planet formation. However, the evidence suggests that these grains may be essential for the formation of planets.