(V.75:4) Each human being has his or her own special finger prints not resembling anyone else, indicating that our Lord (Allâh) is the Most Superior Creator of everything: Lâ ilâha illâ Huwa (none has the right to be worshipped but He).
(V.75:9) Narrated Abu Hurairah رضي الله عنه : The Prophet صلى الله عليه وسلم said, "The sun and the moon will be folded up (or joined together or deprived of their lights) on the Day of Resurrection." (See the Qur’ân 75:9) (Sahih Al-Bukhari, Vol.4, Hadith No.422).
(V.75:29) Or it may mean: hardship and distress will be joined with another hardship and distress (i.e. distress of death, and of the thought as to what is going to happen to him in the Hereafter). (Tafsîr At-Tabarî ).