Final answer:
The statement is false; observations of exoplanets and solar nebulas provide insight into planetary system formation, allowing us to theorize about the solar system's origins.
Step-by-step explanation:
The statement that it is impossible to theorize about the formation of the solar system because no other planetary system can be observed is false. We have observed many other solar nebulas and exoplanets outside our solar system. These observations, especially of young stars surrounded by disks of gas and dust, support the idea that our solar system is not unique in its formation process. Furthermore, these exoplanetary systems provide critical data that has led to revisions and enhancements of our models for planetary system development.