On many a Geneva morning, deep beneath the Franco-Swiss border, Dr. James Beacham, a particle physicist working at CERN’s Large Hadron Collider, is wrestling with one of the most profound questions humanity can ask: Will everything, from the swirling galaxies we admire through telescopes to the atoms making up our own bodies, eventually fade out of existence? Drawing on modern physics, centuries of cosmic storytelling, and experiments at the smallest imaginable scales, Beacham and his colleagues are working to solve perhaps the grandest riddle in science: When and how will the universe die?
Setting the Scene: Our Place in the Cosmos
The microphones on Maria Nimfuehr’s Renegade Science Podcast just warm up when Dr. Beacham leans in, determined to put our cosmic significance into perspective. “We are stuck on this rock, this very friendly, special rock in this weird, normal-looking, not even weird, just normal galaxy in this normal cluster of galaxies in this weird corner of the universe. So there’s really no reason for us to think that we should have special insight into this.” he says, a blend of humility and wonder in his tone. Then, energized by the limitless potential of discovery, his demeanor brightens. “But it’s incredible that we can use science, physics, and astronomy to actually measure, and form real, scientific ideas. about how the universe might end. That’s pretty amazing when you think about it.”
Welcome to another episode of Maria Nimfuehr’s science podcast, where each week’s discussion tries to stretch our imaginations as far as the universe will allow. Dr. James Beacham isn’t just a physicist. He acts as a bridge, translating the mysterious world of particle collisions into ideas anyone can appreciate. His mission is to turn the unimaginable into something we can talk about.
Looking Back: The Universe’s Origin Story
Beacham enjoys exploring life’s biggest puzzles. He is comfortable, even playful, when engaging with the ultimate question: How will the universe end? “A thousand years ago, people invented tales to explain what they couldn’t understand. There was no scientific method to help them predict anything concrete,” he says. “Now, our methods are more reliable – even if they’re not perfect.”
Maria gives Beacham the space to use memorable metaphors. “The universe is roughly 13.8 billion years old. It began extremely small – we don’t really know what happened at the exact beginning. Maybe there wasn’t even a true starting point. Asking ‘what came before the Big Bang’ may not even make sense,” he says. Part of his appeal is his honesty about what we don’t know – embracing mystery doesn’t make science any less meaningful.
“Forget fireworks. Imagine if you and I, right here, took a horse and magically stretched it until it was the size of the known universe in a tiny split second. Poor horse! But that’s what cosmic inflation was like at the moment of the Big Bang. Then it just stopped – and we don’t really know why.”
The Great Expansion: A Universe in Motion
Beacham points out that, after its wild beginning, the universe expanded – but not consistently. For about ten billion years, things slowed down. Then, a few billion years ago, something changed. The fabric of space itself began stretching faster.
This was a bombshell discovery for physicists in the late 1990s. “In 1998, a group of theorists and astronomers realized something surprising: the universe isn’t just expanding, but accelerating,” recalls Beacham. Up until then, scientists believed the universe might someday stop expanding and collapse back in on itself – a scenario called the ‘Big Crunch.’ The new data showed just the opposite.
"So, this expansion is just going to keep going, forever. It’s never going to slow down."
The Slow Fade: Heat Death Awaits
What does this mean for the universe’s end? There’s no dramatic explosion or glorious collapse waiting for us – just an endless, quiet fade called heat death.
“Most likely, the universe will end in what we call ‘heat death.’ That’s when nothing at all can ever happen again,” Beacham explains.
He continues: as the universe expands, stars and galaxies will move increasingly far apart. Stars will eventually burn out, leaving only the darkness. Over truly immense timescales, galaxies will scatter, and even atoms might fall apart if protons aren’t completely stable. The last things left, black holes, will slowly evaporate away through Hawking radiation.
At the very end, nothing is left that can interact or change. “The universe will reach a state of maximum disorder, and settle at a temperature just above absolute zero – not quite zero, but close enough. At that point, nothing will ever happen again, maybe for eternity.” When Maria jokes about how we’ll be long gone by then, Beacham laughs and agrees: “We’ll be such ancient history, we won’t even make it into the record books.”
Our Local Story: The Fate of Earth
Even closer to home, our planet’s eventual fate is pretty dramatic, too. “In about six billion years, the Sun will expand enough to swallow Mercury and Venus. The Earth might escape, but the Sun will get so hot that it will burn whatever is left here to a crisp,” Beacham says. Eventually, the remnants of Earth will spiral toward the remains of the Sun, be torn apart by gravity, and sprinkle their dust into oblivion.
Remarkably, even this dramatic ending is just one small side story in the universe’s much larger narrative.
What Drives the Universe’s Acceleration? Dark Energy
So what causes the universe’s strange, accelerating expansion? “It’s likely tied to something called dark energy, which is a completely separate mystery from dark matter,” Beacham explains. “About 68% of everything in the universe is made up of dark energy, and it’s what’s driving this expansion. But we really don’t know what it is. There’s a huge chunk of the universe we just can’t see or fully comprehend.”
Dark energy isn’t like the energy we experience day-to-day. Even empty space isn’t really empty, as Beacham explains: “Quantum mechanics tells us nothing can ever be completely still, not even the vacuum. It’s always fluctuating.” Oddly, the vacuum energy predicted by quantum mechanics should be far larger than what astronomers actually observe.
The Mystery of Time’s Arrow
Maria brings up another fundamental question: Why does time only move forward? Beacham lays out the basics. “Space and time aren’t really separate – they’re parts of one thing: space-time. But time is special. We can move around in space, but we can’t go backward in time. Time’s like a river, always carrying us forward.”
He points out that every explanation we have about time just assumes that time is there, so it’s surprisingly hard to really define what time actually is.
Will Protons Decay? What Might Remain?
Regarding whether protons will eventually decay, Beacham says the jury is still out. “Some believe protons must decay eventually, but it’s still just a theory.” Whether or not protons last forever, the universe seems headed for silence – punctuated only by a few stray, lonely particles drifting through the endless dark.
Finding Meaning in the End
As the podcast wraps up, Beacham doesn’t sound defeated. Instead, he’s energized by our ongoing pursuit of answers. “To me, the idea of heat death, or the endlessly distant future, is fascinating scientifically,” he says, the smile in his voice obvious. Science can’t stop the universe’s final fade, but it does make that fate into a story worth sharing – and understanding together.
What good is it, to know so much doom? It is, in fact, the very act of curiosity and discovery that gives meaning to our brief cosmic window. As Beacham notes, “Imagine if you had time travel – we could travel into the future to see the universe when you couldn’t see anything at all… it would be the ultimate sensory deprivation chamber.” He’s half-joking, but it’s clear: the journey of exploring our fate, not just the destination, is the triumph.
Maria and James linger on the topic one last time: what’s left for humanity, knowing that the universe trends toward entropy, silence, and decay? “Keep the wheel of human curiosity going,” Beacham urges. Whatever the physics says about our future, our real victory is asking, seeking, creating – staring down eternity with a light on our faces and the notebook never closed.
The universe may end, but, at least for now, so does the episode. The microphones click off, but Beacham’s message echoes: we are finite, the cosmos vast. But with each question bravely posed and each answer honestly earned, we live immortally in the story of the universe itself.