Editorial: Editor's challenge in space physics: solved and unsolved problems in space physics.

This article is an editorial that discusses the current state of space physics and the open questions that still exist in the field. It highlights the progress that has been made in understanding various aspects of space, such as planetary magnetospheres, the solar environment, and the interstellar medium. The editorial also introduces a research topic that includes 17 papers addressing different space physics issues, ranging from wave-particle interactions to the coupling of the Sun and Earth's atmosphere. The goal of this research topic is to assess the state of space physics, identify outstanding questions, and encourage dialogue among researchers. [Extracted from the article]