A new measurement offers insights on the density of the mysterious force driving the Universe's expansion.
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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.
Early on, only matter and radiation were important for the expanding Universe. After a few billion years, dark energy changed everything.
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?
As time goes on, dark energy makes distant galaxies recede from us ever faster in our expanding Universe. But nothing truly disappears.
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.
In a far-reaching discovery with astrophysicist Karolina Garcia, we discuss what's in the Universe and how it grew up.
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.
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?
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.
If our Universe were born a little differently, there wouldn't have been any planets, stars, galaxies, or chemically interesting reactions.
The conservation of energy is one of the most fundamental laws governing our reality. But in the expanding Universe, that's just not true.
Our model of the Universe, dominated by dark matter and dark energy, explains almost everything we see. Almost. Here's what remains.
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?
From black holes to dark energy to chances for life in the Universe, our cosmic journey to understand it all is just getting started.
Two fundamentally different ways of measuring the expanding Universe disagree. What's the root cause of this Hubble tension?
Over time, the Universe becomes less dominated by dark matter and more dominated by dark energy. Is one transforming into the other?
Sometimes, going "deeper" doesn't reveal the answers you seek. By viewing more Universe with better precision, ESA's Euclid mission shines.
From how life emerged on Earth to why we dream, these unanswered questions continue to perplex scientists.
While humanity has been skywatching since ancient times, much of our cosmic understanding has come about only recently. Very recently.
Freethink's weekly countdown of the biggest space news, featuring Starship's second test flight, a new "dark mysteries" telescope, and more.
The farther away they get, the smaller distant galaxies look. But only up to a point, and beyond that, they appear larger again. Here’s how.