Universe
The universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments. Since the early 20th century, the field of cosmology establishes that space and time emerged together at the Big Bang 13.787±0.020 billion years ago and that the universe has been expanding since then.
Extends: Universe, [Articles containing video clips](https://wikipedia.org.ai/Articles containing video clips), [Astronomical dynamical systems](https://wikipedia.org.ai/Astronomical dynamical systems), [Concepts in astronomy](https://wikipedia.org.ai/Concepts in astronomy), Environments
Properties
| Property | Expected Type | Description |
|---|---|---|
| Title | Text | Universe |
| Image | Text | Hubble ultra deep field.jpg |
| Caption | Text | Hubble Ultra-Deep Field, galaxies, Moon |
| Label1 | Text | Age, ΛCDM model |
| Data1 | Text | 13.787 ± 0.020 billion years |
| Label2 | Text | Diameter |
| Data2 | Text | Observable universe |
| Label4 | Text | energy |
| Data4 | Text | 9.9 kg/m3 |
| Label5 | Text | Average temperature (cosmic microwave background) |
| Data5 | Text | 2.725 K (-270.4 °C, -454.8 °F) |
| Label6 | Text | Main contents |
| Data6 | Text | Ordinary (baryonic), matter, Dark matter, Dark energy |
| Label7 | Text | Shape |
| Data7 | Text | Flat |