Hi, everyone, I just had a great conversation with Geraint F. Lewis, a Welsh astrophysicist and Professor at the University of Sydney, about some of the biggest questions in cosmology, physics, and our understanding of the world.

We explore what the Big Bang theory tells us about the beginning of the universe, why our current understanding of physics reaches limits when we try to look further back in time, and how neutrinos also known as ghost particles could reveal secrets about the cosmos — including why matter exists at all.

Professor Lewis also explores what sparked the Scientific Revolution, how modern science transformed our understanding of the world, and why Einstein challenged aspects of quantum mechanics.

Professor Lewis's latest book, The Shortest History of Reality: From Plato’s Cave to the Mind-Bending Discoveries of Modern Physics — The Human Quest to Explain the World, traces humanity’s changing understanding of reality, from everyday intuition and ancient philosophy to the discoveries of modern physics. It explores the ideas that reshaped our view of existence, from Newton’s universe to the strange probabilities of quantum physics and beyond.

If you're interested in these subjects, you can check out our conversation, hope you find it insightful: https://youtu.be/38rUHEeAVHw

Is there truly nowhere I can watch this anymore? Its the series that got me into teaching science and I was hoping to use some bits of it to teach Earth science to my 7th graders. I live in the US, incase thats important.

Mercury and Venus could be engulfed, while Earth will become uninhabitable long before that. As the Sun expands and brightens, its habitable zone will move outward, potentially warming the icy moons of the outer Solar System.
Titan could be one of the most interesting candidates. It already has a thick atmosphere and complex surface chemistry, and NASA has discussed how a red giant Sun could make worlds like Titan much warmer.
Which moon do you think would have the most interesting future?

I would like to get the documental Cosmos: A space-time odyssey, on physical media, either DVD or Blue ray in Spanish (Castellano) but since it seems it got disconnected, I have not been able to find it neither on Amazon nor any other web. Not even second hand. I even asked Chat GPT to help me search for links and nothing. If anyone has any info, I would appreciate it.

I haven’t been able to find it anywhere. I can only find season 2 but I’m looking for season 1 specifically.

It’s interesting how much had to be figured out just to walk on the Moon.

Walking on the Moon was a first-time experience, and even extensive training could not fully prepare the Apollo astronauts for it.

So how did they do it, and how did their ability to travel on foot evolve from one mission to the next?

In this short video, we take a closer look at how Apollo astronauts adapted to walking on the Moon.

I don't know what was seen above me in the sky. I don't know exactly what it is, it's quite possible it's a Rocket (balestic), maybe a drone , this cannot be denied for sure, since I live in Russia, but I believe that this is an asteroid, but the fact that it was 2 times in a row is strange. I hope for the help of specialists.

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