Why does Neil on the first episode : "The last time we were here together this hallway had no name...." I tried googling but there aren't any previous series except the ones made by Carl Sagan. Am i missing something or were there other series/documentary before? Thank you in advance!

From black holes to dark matter, what cosmic enigmas keep you up at night pondering the vastness of the universe? Let's delve into the cosmos together!

I have watched it long time ago...

Want to rewatch it

Please share where it is available

If I remember correctly, there's an episode [not sure if it's Sagan or Tyson] where he talks about the "two different types of God":

The Religious God and the Cosmic God.

tbh, I'm not even sure it was on Cosmos, but I have a vague memory of it.

Thanks!

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Now, stick around, because today we're diving headfirst into the depths of the cosmos with a discovery that's nothing short of mind-blowing. We're talking about an "extremely exciting" gravitational-wave signal that's reached us from the far side of the universe. No small feat, considering the vast distances these waves have traveled to whisper their cosmic secrets to us here on Earth.

This isn't just another blip on the radar for astronomers. This signal, folks, comes from what appears to be a cataclysmic event - the collision of a neutron star with an unidentified object, shrouded in mystery. But here's where it gets particularly intriguing: this unidentified celestial body is believed to reside within what scientists refer to as the "mass gap." We're talking about a sweet spot, between 2.5 and 4.5 times the mass of our Sun, which sits awkwardly between the heaviest neutron stars and the lightest black holes known to us.

So why should we care about these celestial heavyweights duking it out billions of light-years away? Well, it's all about the insights they offer into the fabric of the universe. This discovery was made possible by the LIGO-Virgo-KAGRA Collaboration, using three distinct detectors spread across the globe. These detectors are so finely tuned that they can pick up the ripples in spacetime itself, caused by such immense cosmic events. The detection of this particular signal, known as GW230529, was a testament to the incredible advancements in observational astronomy and marks a significant achievement in our understanding of gravitational waves.

Let's put this into perspective. Imagine you're sitting on a tightly stretched fabric, and someone drops a heavy object somewhere else on it. You'll see ripples emanating from where the object landed, right? That's pretty much what these detectors are picking up, but on a cosmic scale. And this specific ripple? It's special because it's offering us a glimpse into the so-called mass gap, a realm that holds more questions than answers about the nature of the universe.

Geraint Pratten from the University of Birmingham offered a slice of expertise on the matter. He shed light on the fact that, despite the groundbreaking discovery, determining the exact nature of these cosmic entities – whether black holes or neutron stars – isn't straightforward from the gravitational wave signal alone. Yet, the indication that one of these objects likely resides within the elusive mass gap adds a tantalizing layer of mystery and excitement to the analysis. It's this kind of puzzle that keeps astrophysicists like Pratten and his colleagues up at night, unraveling the secrets of astrophysical processes and the cosmic dance of the universe's most massive objects.

So, what does this mean for the future? Well, it's all about piecing together the puzzle of our universe's most violent events and their aftermath. Each discovery like this acts as a piece of the cosmic jigsaw, helping scientists to fine-tune their understanding of the stellar life cycle and the complex interplay between matter and gravity. Who knows what these gravitational waves will tell us next? They're like cryptic messages from the universe, and we're just starting to learn how to decode them.

In conclusion, this discovery isn't just a victory lap for the astronomers involved; it's a beacon of progress in our quest to fathom the unfathomable. As we sit here on our tiny blue dot, spinning in the vast cosmos, it's revelations like these that remind us of the incredible journey we're on in understanding the universe that surrounds us.

Hey everyone,

Huge fan of Carl Sagan's Cosmos: A Personal Voyage! I was wondering if anyone knows where I can find just the audio version. I'd love to listen to Carl's voice every night to fall asleep.

Thanks in advance!

In the 12th episode of Cosmos, Carl Sagan speculates the contents of an Encyclopedia Galactica, and shows three civilization summaries, including one of humanity. Many terms were and still are unknown to me, not being a native English speaker didn’t help. I would like to ask if anyone who understood most if not all of the text could explain the meaning.

Thank you for your time.

It's so embarrassing it took me so long. But I finally realized a lesson from 2D world. We go through life taking depth for granted. We take our 3 dimensions for granted. But as we developed from childhood, we actually had to get used to measuring the parallax with our eyes. Although we can tell distance, and experience 3D, it is only due to our brains processing of this parallax.

Recognizing this, I suppose an intriguing lesson from it all would be that you and I learned how to interpret a dimension higher than what is actually visually experiencial to us. Since we can interpret our interactions with reality as rooted in 3 spacial dimensions, it doesn't necessarily mean that you must close off your problem solving skills to attempt to scientifically deduce higher numbers of spacial dimensions.

Flatland was such an extraordinary lesson for human perception and scientific reasoning. I can't believe it took me so long!

Edit: I'm curious what your take on this thought experiment is.

What is the "Japanese/Irinese tower" in series 4, Cosmos: Possible Words?
Time mark: 00:04:22. Its described as old housing with the oldest ledder in the world.
Smth like 5000 years before Egipt Piramids.

Many thanks for all replyings!