In gods, Nut (CR:35) (LH:9) (TL:44), hieroglyphs: , , , or , is the Egyptian goddess of the heaven, conceptualized as the arched body that contains the fixed stars; daughter of Shu (air) and Tefnut (moisture); female counterpart to Geb (earth); mother of the god-goddess sibling pairs: Osiris + Isis and Set + Nephthys.
In 2315BC, described in the Unas Pyramid Texts, detailed on the burial chamber walls of pharaoh Unas, inside of the Unas Pyramid, which is built between the Sekhemkhet Pyramid (c.2645BC) and the Djoser Pyramid (c.2675BC), at Saqqara, the necropolis of Memphis, we find that the god Atum, in the form of Atum-Khepri appeared on top of a mound, shining like the bennu bird (morning sun), that his first act of creation was to make the god pair Shu (air) and Tefnut (moisture), who in turn procreated the gods Geb (earth and Nut (heaven):
- “Oh Atum-Khepri, when thou didst mount as a hill; and didst shine as bnw [Bennu] of the ben (or benben) in the temple of the ‘phoenix’ in Heliopolis; and didst spew out as Shu [A], and did spit out as Tefnut; (then) thou didst put thine arms about them, as the arm(s) of a ka, that thy ka might be in them. Atum, so put thine arms about Unas; about this temple, about this pyramid, as the arm (s) of a ka; that the ka of Unas may be in it, enduring for ever and ever. Oh great Ennead who are in Heliopolis: Atum, Shu, Tefnut, Geb, Nut, Osiris, Isis, Set, Nephthys.”
- — Unas Scribe (2315BC), Unas Pyramid Text (§:600) 
Geb and Nut then procreated the gods: Osiris, Isis, Set, Nephthys. These nine gods in total formed the god family called the "Ennead" by the Greeks. The myth became known as the Heliopolis creation myth.
The job of Shu, was to separate Geb and Nut from each other, because they were lovers, and hence the structure of the world came to be, according to this myth, as illustrated below:
The following are related quotes:
- “Plutarch's version of the myth of Isis and Osiris connects the various episodes, many of which can be documented from Egyptian sources, into a single, running narrative (On Isis and Osiris, 12-19). The story begins with Kronos (Geb, the Egyptian earth god) and Rhea (Nut, the Egyptian sky goddess) overcoming the curse of Helios (Re, the sun god) with the help of Hermes (Thoth, the Egyptian moon god) by producing five children on five intercalary days: Osiris, Horus, Typhon (Set), Isis, and Nephthys. As pharaoh of Egypt, Osiris brings civilization to that country and to the whole world. Typhon, however, gathers conspirators and plots to kill Osiris. First, he imprisons Osiris within a coffin and throws it into the Nile River, and later he dismembers the body of Osiris and scatters the pieces all around Egypt. One piece, the penis, is lost forever in the Nile River. In both episodes, the reproductive power of Osiris is sub-merged in the Nile. (Isis grieving and searching for Osiris and burning away the mortality of the infant prince of Byblos can be compared with …”
- — Marvin Meyer (1999), The Ancient Mysteries
- Budge, Wallis. (1904). The Gods of the Egyptians, Volume Two (§:Nut, pgs. 100-; image, pgs. 94-96; Nut giving birth image, pg. 101). Dover, 1969.
- (a) Alford, Alan. (2004). The Midnight Sun: the Death and Rebirth of God in Ancient Egypt (pg. 338). Publisher
(b) Pyramid Texts: 588-600 – Sacred-Texts.com.
- Meyer, Marvin. (1999). The Ancient Mysteries (pg. 160). Publisher.
- Nut – Hmolpedia 2020.