Universe Expansion

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Starts With A Bang
Ask Ethan: Could evolving dark energy lead to a Big Crunch?
There's some, but not overwhelming, evidence that dark energy is evolving. What would it take for a "Big Crunch" to be our cosmic fate?
Ethan Siegel
Illustration of the universe's large-scale structure with colorful concentric circles, representing cosmic structure distribution, against a black background.
Starts With A Bang
Ask Ethan: Is the Hubble tension the same thing as dark energy?
Observations with the Hubble space telescope helped cement dark energy and reveal the Hubble tension. How are these two things so different?
Ethan Siegel
Starts With A Bang
Ask Ethan: How and when will the Universe die?
As the Universe ages, it continues to gravitate, form stars, and expand. And yet, all this will someday end. Do we finally understand how?
Ethan Siegel
An abstract animation of white, textured patterns symmetrically forming on a blue and black background evokes the mysterious dance of dark energy, subtly hinting at its weakening presence as if guided by the precision of DESI.
Starts With A Bang
Ask Ethan: Is dark energy no longer a cosmological constant?
The Universe isn't just expanding; the expansion is accelerating. If different methods yield incompatible results, is dark energy evolving?
Ethan Siegel
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