Shiva is Energy.
Three eyes of Shiva, the energy are the three sources of energy external to all matter forms. They are Dark Energy that expands the Universe, Cosmic Microwave Background that radiates over the Universe's space and Vacuum energy that fills the otherwise empty space. These three are the three eyes or sources of Shiva, the energy.
The energy that fills up the matter forms, as their 'internal energy' is Easwari.
Same way, the energy that fills the 3 dimensions of the four dimensional space is called tri-pura-sundari. It is the vacuum energy as in modern science. Since the vacuum energy makes the otherwise empty space beautiful by being the bearer of all the Universe, it is described as 'Sundari'. Hence the name 'tripura-sundari'.
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Voice over acknowledgement – The glory of Goddess Tripurasundari - a speech by Smt. V. Lalitha-Part 1 - YouTube
Singer - Keerthana
Three eyes of Shiva, the energy are the three sources of energy external to all matter forms. They are Dark Energy that expands the Universe, Cosmic Microwave Background that radiates over the Universe's space and Vacuum energy that fills the otherwise empty space. These three are the three eyes or sources of Shiva, the energy.
The energy that fills up the matter forms, as their 'internal energy' is Easwari.
Same way, the energy that fills the 3 dimensions of the four dimensional space is called tri-pura-sundari. It is the vacuum energy as in modern science. Since the vacuum energy makes the otherwise empty space beautiful by being the bearer of all the Universe, it is described as 'Sundari'. Hence the name 'tripura-sundari'.

Tripura Sundari Ashtakam
Background Shiva is Energy. Three eyes of Shiva, the energy are the three sources of energy external to all matter forms. They are Dark Ener...
Voice over acknowledgement – The glory of Goddess Tripurasundari - a speech by Smt. V. Lalitha-Part 1 - YouTube
Singer - Keerthana