Dark energy is one of the biggest mysteries in all the Universe. Is there any way to avoid “having to live with it?”
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Here’s what recent DESI measurements suggest — and why it’s too early to update conventional predictions about the Universe’s distant future.
A new measurement offers insights on the density of the mysterious force driving the Universe’s expansion.
Early on, only matter and radiation were important for the expanding Universe. After a few billion years, dark energy changed everything.
From ancient Greek cosmology to today’s mysteries of dark matter and dark energy, explore the relentless quest to understand the Universe’s invisible forces.
Measurements of the acceleration of the universe don’t agree, stumping physicists working to understand the cosmic past and future. A new proposal seeks to better align these estimates — and is likely testable.
The zero-point energy of empty space is not zero. Even with all the physics we know, we have no idea how to calculate what it ought to be.
Dark energy is one of the biggest mysteries in all the Universe. Is there some way to avoid “having to live with it?”
For every proton, there were over a billion others that annihilated away with an antimatter counterpart. So where did all that energy go?
From the earliest stages of the hot Big Bang (and even before) to our dark energy-dominated present, how and when did the Universe grow up?
As time goes on, dark energy makes distant galaxies recede from us ever faster in our expanding Universe. But nothing truly disappears.
Because of dark energy, distant objects speed away from us faster and faster as time goes on. How long before every galaxy is out of reach?
All forms of energy affect the expanding Universe. But if matter and radiation slow the expansion down, how does dark energy speed it up?
Just by observing the tiny amount of deuterium left over from the Big Bang, we can determine that dark matter and dark energy must exist.
There are a wide variety of theoretical studies that call our Standard Model of cosmology into question. Here’s what they really mean.
In a far-reaching discovery with astrophysicist Karolina Garcia, we discuss what’s in the Universe and how it grew up.
When cosmic inflation came to an end, the hot Big Bang ensued as a result. If our cosmic vacuum state decays, could it all happen again?
From the Big Bang to dark energy, knowledge of the cosmos has sped up in the past century — but big questions linger.
In many ways, we are still novices playing with toy models seeking to understand the stars.
The evidence that the Universe is expanding is overwhelming. But how? By stretching the existing space, or by creating new space itself?
Since its observation discovery in the 1990s, dark energy has been one of science’s biggest mysteries. Could black holes be the cause?
Cosmologists are largely still in the dark about the forces that drive the Universe.
From the earliest stages of the hot Big Bang (and even before) to our dark energy-dominated present, how and when did the Universe grow up?
If our Universe were born a little differently, there wouldn’t have been any planets, stars, galaxies, or chemically interesting reactions.
Yes, dark energy is real. Yes, distant galaxies recede faster and faster as time goes on. But the expansion rate isn’t accelerating at all.
The conservation of energy is one of the most fundamental laws governing our reality. But in the expanding Universe, that’s just not true.
All of the matter and radiation we measure today originated in a hot Big Bang long ago. The Universe was never empty, not even before that.
If the Universe is expanding, and the expansion is accelerating, what does that tell us about the cause of the expanding Universe?
The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?
Our model of the Universe, dominated by dark matter and dark energy, explains almost everything we see. Almost. Here’s what remains.