I every edge was equally far, wouldn’t that mean that the earth is in the dead center of a massive universe? How unlikely would it be to have a universe so unfathomably large and somehow we are in the exact center of it?

And here is my last video about rocky planets.

Would we be able to observe in real time a galaxy at the edge of the observable universe disappear as the space between us expands enough that it's light can longer reach us?

Did you know there are stars orbiting a black hole at the center of the Milky Way? 🌌

Astrophysicist Erika Hamden tells us about this star cluster that lives around Sagittarius A* and what it teaches us about the black hole. Scientists have been tracking these stars for decades, watching them complete full orbits. Those orbits are actually how we know the black hole is there, and researchers use them to measure its mass and pin down its exact location.

This project is part of IF/THEN®, an initiative of Lyda Hill Philanthropies.

I wonder how many of them contain habitable planets.

I remember in my cosmology class we learned about the early dilemma of the shape of the universe; so, what would a hyperbolic universe look like? Would life evolve differently? Would physical laws still hold?

Absolutely incredible. Sorry for the Interstellar music score.

Can be inaccurate. This is my first space video.

Hello there,

Here is a timeline about the future of the Earth. In this video, I will show it's evolution and how it will end. From the ARGB to the end of the life, what would happens to our civilisation ?

This may be not accurate and since I begin space themed animation, please, be clement. :)

https://www.youtube.com/watch?v=E_1cqqh_flU

As you can see, I try to be accurate about geological events on every planets, first Venus.

I did this quickly.

Hello there, I am durna, I present you one of my first space videos

I've been thinking a lot about the universe lately, how vast it is - the history of earth over billions of years, how humans are a sneeze in that timescale and how rare life is in the part of the universe we are aware of or have an understanding of.

Its been making me think a lot about the trivialities of life in context - some of the things we do out of routine, some of the things we stress about, fight for etc. Basically opened a bunch of existential questions

I was thinking and reading about how the universe we know may one day have no life, and that the universe we know may actually be a small part of something bigger we cant comprehend and i just find it fascinating

I'm coming at this from a pure layman's viewpoint, are there any books to read or places to start that can further develop my interest that aren't too heavy? Or any concepts along the lines above i could study - i saw something about string theory, not sure what that is

Much appreciated

Even if you don't believe in panspermia because of whatever logical conceit that you use to dismiss it, you must accept that for over 3.5+ billion years somehow the Earth has housed the exact sort of microbes that can easily travel to, infect, and propagate on other terran bodies.

So even if your geocentric views on the origin of life are true, panspermia must have been occurring locally for billions of years.

If you dispute this, please tell us what celestial event could possibly sterilize the estimated 10⁴¹ self-replicating microbes that have supposedly existed in the entire history of Earth, especially considering that each and every of these microbes is fully capable of becoming the LUCA of all subsequent life on any other terran body that contains liquid water and chemical energy?

And every time so-called "astrobiologists" find what they all once agreed were chemical signatures of life literally everywhere, these former biosignatures are written off the exact same way that the Catholic church wrote off heliocentrism. Instead of accepting that any self-replicating system capable of infecting other places obviously must have done so after having ben given countless millions of chances to spread over (at least) 3.5+ billions of years, "astrobiologists" desperately seek non-microbial explanations for every disequilibrium that was previously accepted as a clear biosignature.

Hi r/universe, a while ago I made this GPU accelerated Barnes-Hut n-body simulation in CUDA that runs on my laptop at ~430 ms per step.

By fiddling with the simulation parameters I was able to obtain this visually interesting result. The clip shows a sort of bounce back after an initial collapse, starting from a spherical distribution of ~4 million particles. Note that the integration timestep is relatively high, causing numerical instabilities at the collapse point, but I guess that's what is making the particles fly outwards and clump in this peculiar way.

You can find the code at: https://github.com/lechebs/nbody

I'd love to get feeback from curious and experts in the field!

Views of the Great Lakes of North America from orbit. Photos by: NASA spacetroves

I have an interest in the macro and micro worlds and discovered that contemplating and studying the universe is terribly fascinating. But I also know that thinking deeply about this stuff is hard! It's not normal for 99% of the population. Whenever I talk about deep matters related to the universe, physics, consciousness, philosophy--most people just kind of glaze over at some point. It's too much for them.

The most obvious thing that trips people up is the scale and scope of all the stuff. Humans are terrible at visualizing large numbers (like over 100K). And yet physicists work in the ridiculously large and the infinitesimally small every day. How do you do that and not lose your marbles?

And that doesn't even touch on the weirdness of it all. Relativity is crazy because of the scale of the universe and speeds at which light waves travel. But Quantum mechanics is so counter-intuitive it hurts just trying to understand it. And string theory? Shit gets really weird really fast.

If you're a physicist, I'd love to hear your thoughts on what a day in the life is like when you're swimming in such deep waters all the time.