Allah sent the Prophet Muhammad, (peace be upon him), as a Messenger to the whole universe. Allah says in the Qur'aan:
We sent thee not, but as a mercy for all creatures. (Qur'aan 21:107).
And so Prophet Muhammad (peace be upon him) is the Messenger of Allah to the bedouins in the desert just as he is the Messenger of Allah to the present-day scientist in his modern laboratory. He is the Messenger of Allah to all peoples of all times. Before Prophet Muhammad (peace be upon him), each Messenger was sent exclusively to his own people: to every people a guide has been sent. (Qur'aan 13:7).