Assalamualaikum...
The Koran and the Hadith explains in the Israj and Mikraj that the Buruj took the Prophet for the single night journey to the seven heaven and when he came back Abu Bakar was still alive and around. So Einstein's theory is incomplete in as much as Issac Newton was. So go find the fudge factor.
Well, if we just think at it for a second, Einstein's theory are limited to the physical world, while the prophet's journey are both physical and spiritual (That's why he can meet the previous prophets). So I won't be so fast to say that Einstein's theory is incomplete (and vice versa) for both of these world are different. Besides, if the prophet returns home at a different time, things might be a lot different now, praise to god that it didn't happen, for god knows best.
I have experience on conversation with some people, who actually rejects that man had ever go to moon.
The argument that they always use is "The moon is not in the first layer of the heavens", and many similar
spiritual related arguments. The problem is, they tried to infuse physical reality of this world with spiritual world. Some "Kitabs" tells the nature of the heavens in spiritual explanation (By people who attained "Khasyaf"). For me, both world are real, but you just can't use spiritual arguments to deny the facts of the physical world. Sure, we can use it, but be ready to be laugh at.
And I think the right word for the prophet's transport to heavens above are "Buraq", not "Buruj".
May Allah bless us all and show to us the straight path, for us that is still learning and searching to grasp the truth. Ameen