From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime​ It may be that for every star in the universe there are billions of microscopic black holes streaming through the solar system, the planet, even our bodies every second. Sounds horrible – but hey, at least we’d have…

From PBS Space Time. Support Us On https://www.patreon.com/pbsspacetime When a theory makes a prediction that disagrees with an experimental test, sometimes it means we should throw the theory away. But what if that theory has otherwise produced the most successful predictions in all of physics? Then, that little glitch may be pointing the way to…

From PBS Space Time. To learn more, check out: https://www.TheGreatCoursesPlus.com/spacetimepbs Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime “A moving arrow is at rest.” This is obviously a nonsensical contradiction. But Zeno, a Greek philosopher famous for his metaphysical trolling, devised a paradox whose conclusion is just this. Here’s how…

From PBS Space Time. https://www.patreon.com/pbsspacetime​ I have good news and bad news. Bad news first: two years ago we reported on the Crisis in Cosmology. Since then, it’s only gotten worse. And actually, the good news is also that the crisis in cosmology has actually gotten worse, which means we may be onto something! The…

From PBS Space Time. https://www.patreon.com/pbsspacetime​ We know that gravity exerts its pull on light, and we have an explanation for why. Actually, we have multiple explanations that all predict the same thing. And at first glance, these explanations seem to describe completely different causes. So what is the true connection between light and gravity, or…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime​ We know that gravity must cause clocks to run slow on the basis of logical consistency. And we know that gravity DOES cause clocks to run slow based on many brilliant experiments. But I never explained WHY or…

From PBS Space Time. Check Out Overview on PBS Terra: https://youtu.be/Pgj95EntvW0 Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime​ It was pretty impressive when LIGO detected gravitational waves from colliding black holes. Well we’ve just taken that to the next level with a galaxy-spanning gravitational wave detector that may have…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime There’s a deep connection between gravity and time – gravitational fields seem to slow the pace of time in what we call gravitational time dilation. And today we’ll explore the origin of this effect. And ultimately, we’ll use…

From PBS Space Time. Check out Weathered on PBS Terra: https://youtu.be/q1hj9RCWuH0 Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime By the time you’ve read this, a billion billion dark matter particles may have streamed through your body like ghosts. The particle or particles of the dark sector make up the…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Today we’re going to delve into a couple of the most famous paradoxes of special relativity: the Twin Paradox, The Ladder Paradox (aka the Barn-Pole Paradox), and a paradox suggested by our very own viewers, which asks whether…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Since the very beginning of quantum mechanics, a debate has raged about how to interpret its bizarre predictions. And at the heart and origin of that debate is the quantum jump or quantum leap – the seemingly miraculous…

From PBS Space Time. Check Out Weathered on PBS Terra https://www.youtube.com/watch?v=znSN7ZFIaOg&ab_channel=PBSTerra Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime We often think of quantum mechanics as only affecting only the smallest scales of reality, with classical reality taking over at some intermediate level. But in his 1944 book, What is…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Good news everyone: it looks like the universe is going to end with a series of catastrophic explosions. The very, very long story short is that the universe ends in heat death, as it approaches maximum entropy, and…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime The laws of physics don’t specify an arrow of time – they don’t distinguish the past from the future. The equations we use to describe how things evolve forward in time also perfectly describe their evolution backwards in…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Ever wish you could travel backward in time and do things differently? Good news: the laws of physics seem to say traveling backward in time is the same as traveling forwards. So why do we seem to be…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Physicists have a long history of sticking our noses where they don’t belong – and one of our favorite places to step beyond our expertise is the question of consciousness and free will. Sometimes our musings are insightful,…

From PBS Space Time. Our universe seems pretty complicated. We have a weird zoo of elementary particles, which interact through very different fundamental forces. But some extremely subtle clues in nature have led us to believe that the forces of nature were once unified, ruled by a single, grand symmetry. But how does one force…

From PBS Space Time. The Nobel prize in physics this year went to black holes. Generally speaking. Specifically, it was shared by the astronomers who revealed to us the Milky Way’s central black hole and by Roger Penrose, who proved that in general relativity, every black hole contains a place of infinite gravity – a…

From PBS Space Time. Einstein’s special theory of relativity combines space and time into one dynamic, unified entity – spacetime. But if time is connected to space, could the universe be anything but deterministic? And does that mean that the future is predestined? Sign Up on Patreon to get access to the Space Time Discord!…

From PBS Space Time. Is all that exists just whatever exists right now? Is the past erased and the future a void yet to be filled? Well, the answer lies in between the past and the future – in the elusive, ever-moving eye-blink that we call the present. Sign Up on Patreon to get access…

From PBS Space Time. Check Out Overview of PBS Terra: https://bit.ly/33otrUn If you rank the most habitable places in our solar system Venus lands pretty low, with surface temperatures hot enough to melt lead and sulphuric acid rain. And yet it may have just jumped to the front of the pack. In fact, we may…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 Your extensive posting history on r/birdswitharms and your old fanfiction-heavy livejournal are both one tiny…

From PBS Space Time. Take the PBS Digital Studios annual survey: http://to.pbs.org/2020survey One of the most bizarre proposals for life not as we know it doesn’t even use atoms. It proposes that fundamental kinks and defects in the fabric of the universe – cosmic strings beaded with magnetic monopoles – may evolve into complex structures,…

From PBS Space Time. The great physicist Hermann Weyl once said: "My work always tried to unite the true with the beautiful, but when I had to choose one or the other, I usually chose the beautiful." But is this actually good advice for doing physics? Sign Up on Patreon to get access to the…

From PBS Space Time. Thank you to Target for supporting PBS. You can learn more at https://target.com/community Share your story today: https://to.pbs.org/3izZeXh Pin-pricks in the celestial sphere, through which shines the light of heaven? Or gods and heroes looking down from their constellations? Or lights kindled above middle earth by Varda Elbereth and brightened with…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 If you wanna make an omelet you gotta break a few eggs. And by omelet…

From PBS Space Time. Sign Up on Patreon to get access to the Space Time Discord! https://www.patreon.com/pbsspacetime Check out the Space Time Merch Store https://pbsspacetime.com/ Sign up for the mailing list to get episode notifications and hear special announcements! https://tinyurl.com/yx9cusk5 Our galaxy is full of dysfunctional stellar relationships. With more than half of all stars…

From PBS Space Time. The second in our two event series about Theories of Everything! Watch the first one: https://www.youtube.com/watch?v=_izocEgArtQ Please subscribe to Brian Keating’s YouTube Channel to watch one-on-one interviews with the guest speakers and more: https://www.youtube.com/DrBrianKeating Existing Theories of Everything have not yet produced experimental evidence that solves the fundamental challenges facing physics.…

From PBS Space Time. Join two epic livestreams about Theories of Everything! Sign up for prizes, a download link to the videos, and more at http://www.pbsspacetime.com/events. Please subscribe to Brian Keating’s YouTube Channel to watch one-on-one interviews with the guest speakers and more: https://www.youtube.com/DrBrianKeating July 28 @ 4pm Eastern (8pm UTC) – What is a…