An illustration of our cosmic history, from the Big Bang until the present, within the context of the expanding Universe. We cannot be certain, despite what many have contended, that the Universe began from a singularity. We can, however, break the illustration you see into the different eras based on properties the Universe had at those particular times. We are already in the Universe’s 6th and final era. (Credit: NASA/WMAP science team)

The Universe is already in its sixth and final era

From before the Big Bang to the present day, the Universe goes through many eras. Dark energy heralds the final one.

The Universe is not the same today as it was yesterday. With each moment that goes by, a number of subtle but important changes occur, even if many of them are imperceptible on…




The Universe is out there, waiting for you to discover it.

Recommended from Medium

Here’s how NASA’s James Webb Space Telescope will unveil the unknown Universe

These Are The Last Galaxies That Will Remain In Our Night Sky

Beyond solid, liquid, and gas: the 7 states of matter

Hubble’s shining view of deep space beyond the stars

BigBang as a Complex Network

The Insider Secrets for Earth-like Planets Revealed

You Won’t Like The Consequences Of Making Pluto A Planet Again

Ask Ethan: How Does A Photon Experience The Universe?

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Ethan Siegel

Ethan Siegel

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

More from Medium

Is The Universe Actually A Fractal?

How the Sun Will Die. And Why.

An image showing the expanding Sun and the Earth. Everything is red.

‘Black Widow’ Binary Star Found — Shortest Orbit Ever

Record-breaking supernova manages to “X-ray” the entire Universe