Before the beginning there dwelt God the Father,  Jesus Christ, the Holy Spirit, and a host of angels. As three is a  number of perfect union, so the angels existed in three groups...
1. Michael - Archangel over strong angels
2. Gabriel - Archangel over wise angels
3. Lucifer -Archangel over worshiping angels
Before the beginning things existed in eternity. There was no sense of  time. I would imagine if you asked an angel about the timespan of things,  and pertaining to the rebellion he would give you a strange look, as  time was not a concept before earth. 
If we could put a time on Lucifer's fall it would be about 15 billion  years in earth's terms. Which is long for us... Short for the eternal  beings.
Isaiah 14:12-13
12 How art thou fallen from heaven, O Lucifer, son of the morning! how  art thou cut down to the ground, which didst weaken the nations!
13 For thou hast said in thine heart, I will ascend into heaven, I will  exalt my throne above the stars of God: I will sit also upon the mount  of the congregation, in the sides of the north:
And his tail drew the third part of the stars of heaven, and did cast them to the earth: - 
Revelation 12:4
I would imagine that ego swelled in Lucifer's heart as he would lead the  worship, in so much that he thought to exalt himself above God the  Father himself. There was also bound to have been political games with  the other angels as he is called the 'accuser of the brethren.'
Revelation 12:7-10
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
9 And the great dragon was cast out, that old serpent, called the Devil,  and Satan, which deceiveth the whole world: he was cast out into the  earth, and his angels were cast out with him.
10 And I heard a loud voice saying in heaven, Now is come salvation, and  strength, and the kingdom of our God, and the power of his Christ: for  the accuser of our brethren is cast down, which accused them before our  God day and night.
After having enough of that Michael and his strong angels cast Lucifer  and his third out of heaven. As in the beginning the earth was without  form and void, they were cast out into the nothingness of our universe. I  believe that the universe is about 15 billions years old and is the  result and in response to Lucifer's rebellion.
If... E = mc2 ... Then m (matter) = E/c2 (energy)
Therefore, for the big boom to have occurred the matter had to have been  there before the light and energy (E/c2), as the scripture says...
And the earth was without form, and void; and darkness was upon the face of the deep. - 
Genesis 1:2
I would imagine, with these words... 'Let there be light (
Genesis 1:3)',  that the earth (the mass) turned into energy and light (E/c2) and  expanded out from a point of origin, turning into what solar systems the  Father willed it to. So the plasma (E/c2) is actually mass that has  changed state.
4 And God saw the light, that it was good: and God divided the light from the darkness.
5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day. - 
Genesis 1:4,
5
I
 believe that 15 billion years took place between 
Genesis 1:3 and 
Genesis 1:4.  God divided the light and the darkness by putting the earth in orbit  around the sun thus creating the first day of the Earth's creation.  But... The universe was created 15 billion years (give or take a few  billion years) before that.
 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ. - 
Revelation 12:17
We are in battle with the devil over the turf he forsook so many eons ago.  If God wanted to he could have just created another third to replace lucifer. But how much richer we will be as we inherit an eternal life after living under such trials as the planet earth put us under.