Here's some facts of Hazrat Zulqarnain in threads:
Dhul-Qarnayn was a righteous and powerful ruler who embarked on extensive travels across the land. He possessed a special gift from Allah, granting him the ability to travel great distances and control barriers in space.
During his remarkable journey, Hazrat Zulqarnain encountered a remote land near a black hole. As he observed the setting of the sun in this place, it appeared to be sinking into a murky, dark spring or body of water.