Above the decaying temporary material creation are the perpetual forever youthful Vaikuntha Planets where Vishnu resides.

Those Spiritual Vaikuntha Planets surround the central abode of Krishna the Supreme Personality of Godhead and cause of ALL causes, known as Goloka-Vrindavana where Krishna's pastimes with all His dear friends and family members are eternal.

The temporary decaying material creation we live in is created by Maha Vishnu, an expansion of Lord Krishna.

The material creation makes up a 1/4 of the Spiritual Sky (Brahmajyoti) as seen in bottom right corner of painting below.

However, the vast majority of the Spiritual Sky (3/4) is made up of the perpetual Vaikuntha Planets which are the abodes of the 4 armed form of God known Lord Vishnu, Narayana and billions of other names (a different name on each Vaikuntha Planet)

And the centre of Spiritual Sky is the massive central abode of Lord Krishna known as Goloka-Vrindavana, the abode of the two armed Krishna the Supreme Personality of Godhead and cause of ALL causes. 

The painting below shows the perpetual Vaikuntha Planets, the central Spiritual World of Goloka-Vrindavana, and in the bottom right hand cornor, the small material temporary creation.

This material creation is always in a state of impermanence, decline,  decay and repeated birth and death.

The material universes known as Brahmandas, but also called "material worlds", are created by Krishna's Vishnu-tattva expansion Maha Vishnu.  

The use of the word "World" here should not be confused with the small World or earth global planet we live on.

There are Billions of individual massive almost spherical Brahmanda universes that originate from Maha Vishnu's breathing, and from the pores of His skin as seen in painting.

There is also a secondary smaller material universe found deep inside each Brahmanda universe where Garbhodakashayi Vishnu, Brahma  and many planetary systems are found.

From Garbhodakashayi Vishnu, Lord Brahma is born from His navel and then builds or creates the different material planetary systems.

There are 14 planetary systems in our universe that is deep inside our Brahmanda.

However the size of the universe inside each Brahmanda are all different based on the number of heads their Lord Brahma has.

In our material universe, our Brahma has 4 heads, but in other universes, deep inside their Brahmanda, Brahma may have 10, 20, 50, 1000, 10,000 or even a million heads.

There are billions of Lord Brahmas, each with a different number of heads.

When Krishna was ruling Dvaraka, our Lord Brahma from our material universe inside our Brahmanda, came to see Him.

The doorman of Dvaraka immediately informed Lord Krishna of Brahma’s arrival.

When Krishna was informed, He immediately asked the doorman, "Which Brahma is it? What is his name, what universe is he from?"

The doorman returned and questioned Lord Brahma of which Brahma he was.

The doorman asked, "Which Brahma are you, which universe are you from?"

Lord Brahma was very surprised as he believed he was the only Brahma.

He told the doorman, "Please inform Lord Krishna that I am the four-headed Brahma who is the father of the four Kumaras".

The doorman then went and told Lord Krishna what Brahma had said, Lord Krishna then gave Brahma permission to enter.

The doorman escorted Lord Brahma in, and as soon as Brahma saw Lord Krishna he offered obeisances at His lotus feet.

After being worshiped by Brahma, Lord Krishna also honored him with suitable words.

Then Lord Krishna asked him, "Why have you come to visit me?

Brahma replied, "I will later tell You why I have come but first I have some doubts in my mind which I wish You too kindly answer.

Brahma then asked "Why did you inquire which Brahma had come to see You? What is the purpose of such an inquiry? Is there any other Brahma besides me within the universe?"

Upon hearing this, Krishna smiled and closed His eyes in meditation.

Immediately an unlimited number of Brahmas appeared instantly to the great suprise of our Brahma.

Furthermore all these Brahmas had a different numbers of heads.

Some had ten heads, some twenty, some a hundred, some a thousand, some ten thousand, some a hundred thousand, some ten million and others a hundred million.

No one can count the number of faces they had.

To Brahmas surprise, there also arrived many Lord Sivas with various heads numbering one hundred thousand and also some with ten million!

Many Indras also arrived, and they had hundreds of thousands of eyes all over their bodies.

When our four-headed Brahma from our single universe situated deep inside our Brahmanda saw all these opulences of Krishna, he became very bewildered and considered himself to be very small in a great universal creation far bigger than he knew existed!

As these Brahmas arrived to see Krishna, they offered their respects at Krishna’s lotus feet, and when they did this, their helmets touched His lotus feet.

No one can estimate the inconceivable potency of Krishna.

All the Brahmas who were there were resting in the one body of Lord Krishna the Supreme Personality of Godhead and cause of ALL causes.

When all their helmets struck together at Krishna’s ’s lotus feet, there was a tumultuous sound. It appeared that the helmets themselves were offering prayers unto Krishna’s lotus feet.

With folded hands, all the Brahmas and Sivas began to offer prayers unto Lord Krishna, saying, "O Lord, You have shown me a great favor. I have been able to see Your lotus feet."

All the Brahmas then said, "It is my great fortune, Lord Krishna, that You have called me, thinking of me as Your servant. Now let me know what Your order is so that I may carry it on all my heads."

Lord Krishna replied, "Since I wanted to see all of you together, I have called all of you here, all of you should be happy. Is there any fear from the demons?"

They replied, "By Your mercy, we are victorious everywhere, whatever burden was upon us You have taken away by descending on my planet in my universe."

All the Brahmas thought, "Krishna is now staying in my jurisdiction".

None of the Brahmas could see the other Brahmas except for our Brahma who Krishna allowed so he could understand he is not the only Brahma.

Thus the opulence of Krishna's abode Dvaraka was perceived by each and every one of the Brahmas.

As already explained, although they were all assembled together, no Brahma could see any other Brahma except themselves.

Lord Krishna then bade farewell to all the Brahmas, and after offering their obeisances, they all returned to their respective universes deep inside their respected Brahmanda.

After observing all these opulences, our four-headed Brahma from our universe was astonished. He again came before the lotus feet of Krishna and offered Him obeisances.

Brahma then said, "Whatever I formerly decided about my knowledge, I have just now had personally verified -

jananta eva janantu
kim bahuktya na me prabho
manaso vapuso vaco
vaibhavam tava gocarah

"There are people who say, 'I know everything about Krishna.' Let them think in that way. As far as I am concerned, I do not wish to speak very much about this matter. O my Lord, let me say this much. As far as your opulence’s are concerned, they are all beyond the reach of my mind, body and words." (Srimad-Bhagavatam Canto 10 Chapter 14 text 38)

Krishna said, "Your particular universe extends four billion miles in diameter; therefore it is the smallest of all the universes. Consequently you have only four heads.

Some of the universes are 8 billion miles in diameter, some are 8 trillion, some 80 trillion and some eight hundred trillion miles in diameter. Thus they are almost unlimited in area.

According to the size of a material universe, there are many heads on the body of Brahma. In this way I maintain innumerable material universe (Brahmandas).

No one can measure the length and breadth of one fourth of My energy. Who can measure the three fourths that is manifested in the spiritual world?

Beyond the River Viraja is a spiritual nature, which is indestructible, eternal, inexhaustible and unlimited.

It is the Supreme Abode consisting of three fourths of the Lord’s opulences. It is known as paravyoma, the Spiritual Sky.

(Adapted from Sri Caitanya Caritamrta Madhyalila chapter 21)

 

Painting above and below is Maha Vishnu with millions of Brahmanda material universes that all originate Him.

Maha Vishnu is surrounded here by unlimited Brahmanda universes that all originate from His bodily pores and breathing.

As seen in painting above, each Brahmanda universe has a secondary universe deep inside of them where Garbhodakashayi Vishnu, Lord Brahma and many Planetary Systems exist 

Inside each Brahmanda universal shell, a secondary material universe inside them are of different sizes, which also means all of them have a different number of Planetary Systems in them as well.

Our inner material universe deep inside our Brahmanda has 14 Planetary Systems in it that covers a 12.4 billion miles radius (4 billion miles in diameter)

This means surrounding Brahmanda universe our smaller universe is in, is massive. 

It is made of 7 or 8 layers of material qualities, both gross and subtle which is 44 quadrillion, 444 Trillion, 444 billion miles in diameter.

However, if that number is from just the outer edge of our inner material universe, then that distance is from one side of our universe to the surface of the Brahmanda.

This means the diameter of our Brahmanda universal shell we are incased in, is 88 quadrillion, 888 Trillion, 888 billion miles thick.

As explained above, there are 14 Planetary Systems in our material universe found deep inside our surrounding Brahmanda greater universe (universal shell)