The Sun and planets originated in cool gas and dust clouds, within dense molecular clouds that collapse under gravitational forces to form stars and circumstellar disks, which can develop into planetary systems.
The birthplace of the Sun and planets, as well as other stars and potentially their planets, is thought to have been in cool gas and dust clouds. This is supported by the understanding that stars like our Sun form within dense regions of molecular clouds, initiating a collapse due to gravitational force. As these clouds collapse, gravitational force strengthens, leading to the formation of a protostar and often resulting in a spinning circumstellar disk from which planets eventually emerge.
Observations with powerful telescopes like the Hubble Space Telescope have confirmed the presence of these circumstellar disks around young stars in star-forming regions, which resemble the early stages of our own solar system's formation. Thus, the solar nebula, a spinning cloud of gas and dust, is theorized to give rise to both stars and the planetary systems surrounding them.