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The cosmic egg is an ancient mythological concept resurrected by modern science in the 1930s and explored by theoreticians during the following two decades. The idea comes from a perceived need to reconcile Edwin Hubble's observation of an expanding universe (which was also predicted from Einstein's equations of general relativity by Alexander Friedmann) with the notion that the universe must be eternally old.
Current cosmological models maintain that 13.7 billion years ago, the entire mass of the universe was compressed into a singularity, from which it expanded to its current state (following the Big Bang), the so-called cosmic egg.
Ancient ideas about a cosmic egg
Hindu concepts of Hiranyagarbha (golden womb) and Brahmanda (the first egg), are comparable to cosmic egg origin systems. The Bhagavata Purana, Brahmanda Purana, Vayu Purana among others contain references to the initial process of the origins of the universe as a cosmic egg. The twelve phase creation of the universe and the history of our Brahmanda is described in Srimad Bhagvatam.
The Hiranyagarbha Sukta announces: Hiranyagarbhah samavartatagre bhutasya jatah patireka asit, which means, Before creation existed the golden womb Hiranyagarbha, Lord of everything born. (Rig Veda 10.121.1)
The whole universe including sun, moon, planets, and galaxies was all inside the egg, and the egg was surrounded by ten qualities from outside. (Vayu Purana 4.74-75)
Furthermore the god Mithras is often depicted as appearing from within an egg.
Metaphysics and philosophy
"The Crack in the Cosmic Egg" is a book by Joseph Chilton Pearce and Thom Hartmann. The same title was used by musicologists Alan and Steve Freeman for their encyclopedia of Krautrock (also called Kosmische musik), German experimental rock music from the 1970s.
In Hindu tantra, based on the Hindu philosophy of Kashmir Shaivism, the Shri Yantra represents the expansion of the universe from the cosmic egg after its creation by Shiva through the power of Shakti. The cosmic egg is represented by a dot in the center of the Shri Yantra mandala called the bindu.
Cosmic egg in modern cosmology
In the late 1940s, George Gamow's assistant cosmological researcher Ralph Alpher, proposed the name ylem for the primordial substance that existed between the big crunch of the previous universe and the big bang of our own universe. 
Influences on science fiction and popular culture
The cosmic egg concept has caught the imagination of many science fiction and fantasy writers, including the creators of the Marvel Comics character Galactus. Galactus, with the help of the Phoenix Force managed to survive the previous Big Crunch and, preserved in the cosmic egg, emerged as a being of immense power in the present universe. The cosmic egg concept was also used by DC Comics and Marvel comics in their Avengers/JLA crossover, in which it was used to capture their mutual enemy Krona.
In the 1970 science fiction novel Tau Zero by Poul Anderson, a starship forced to travel very close to the speed of light by an engine malfunction survives traversing our universe collapsing via a big crunch into a cosmic egg and re-exploding in a new big bang. The crew of the starship finds a planet similar to Earth in the new universe, upon which they land and establish a colony.
Early 1990s Rotherham 3 piece band The Cosmic Egg were named for this concept, and many of their recordings featured imagery and lyrics inspired by the original Cosmic Egg concept.
Sanskrit scriptures and Vedanta
The earliest ideas of "Egg-shaped Cosmos" comes from some of the Sanskrit scriptures. The Sanskrit term for it is Brahmanda (Brahm means 'Cosmos' or 'expanding', Anda means 'Egg'). Certain Puranas such as the Brahmanda Purana speak of this in detail.
The Rig Veda (RV 10.121) uses a similar name for the source of the universe: Hiranyagarbha, which literally means "golden fetus" or "golden womb". The Upanishads elaborate that the Hiranyagarbha floated around in emptiness for a while, and then broke into two halves which formed Dyaus (Heaven) and Prithvi (Earth) - concepts that existed in nearly every ancient culture, and were also articulated by the Abrahamic religions. The Rig Veda has a similar coded description of the division of the universe in its early stages.
In the myth of Pangu, developed by Taoist monks hundreds of years after Lao Zi, the universe began as an egg. A god named Pangu, born inside the egg, broke it into two halves: the upper half became the sky, while the lower half became the earth. As the god grew taller, the sky and the earth grew thicker and were separated further. Finally Pangu died and his body parts became different parts of the earth.
In the original myth concerning the Ogdoad, the Milky Way arose from the waters as a mound of dirt, which was deified as Hathor. Ra was contained within an egg laid upon this mound by a celestial bird. In the earliest version of this myth, the bird is a goose (it is not explained where the goose originates). However, after the rise of the cult of Thoth, the egg was said to have been a gift from Thoth and laid by an ibis, the bird with which he was associated.
- One egg's lower half transformed
- And became the earth below,
- And its upper half transmuted
- And became the sky above;
- From the yolk the sun was made,
- Light of day to shine upon us;
- From the white the moon was formed,
- Light of night to gleam above us;
- All the colored brighter bits
- Rose to be the stars of heaven
- And the darker crumbs changed into
- Clouds and cloudlets in the sky.
- Cosmic egg
- Phanes (mythology)
- Orphic egg
- Ultimate fate of the universe
- Eino Friberg, trans., The Kalevala: Epic of the Finnish People. Otava Publishing Company, Ltd., 4th ed., p. 44. (1998) ISBN 951-1-10137-4
- Elias Lönnrot, Kalevala. (1849)