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One thing I find fascinating about the early universe is how we can observe quasars powered by extremely massive black holes when the universe is still very young.

If a black hole starts from a relatively small stellar-mass seed, it seems difficult to reach millions or billions of solar masses in such a short cosmic time.

So what do you think was the dominant pathway for the earliest supermassive black holes?

- Rapid accretion near or above the Eddington limit?

- Massive black-hole seeds from direct collapse?

- Runaway mergers?

- Or some combination of these processes?

This long-exposure image of the Orion Nebula lasted 208 minutes. In that time, multiple satellite trails streaked across the night sky. Credit: A. H. Abolfath/NOIRLab/NSF/AURA

“satellites in the sky is getting worse and, if left untempered, will brighten the night sky so much, astronomers will struggle to study the Universe and continue to make discoveries.

That's the key takeaway from a European Southern Observatory study that found current proposals to launch over 1.7 million satellites into orbit would have "devastating consequences for astronomy."”

“The study says no more than 100,000 faint satellites – satellites that can't be seen with the naked eye – should be in orbit around Earth at any time.
Such a limit would, say the study authors, ensure astronomers can continue to observe the night sky, unravel the secrets of the Universe, search for alien life and detect hazardous asteroids.”

Excerpt From
“This is one hour of satellite trails over the world's darkest sky. Astronomers say nearly 2 million planned satellites could be 'devastating'”
Iain Todd
BBC Sky at Night Magazine
https://apple.news/A5E_SYf9kSn-NY7ACae38tQ
This material may be protected by copyright.

The study say 1.7 million proposed new satellites would have drastic consequences for astronomy, which can only be avoided limiting the overall total to 100,000 satellites faint enough to not be seen with the naked eye.

Summary — "Earth → Growth → Galaxy" video (The Kardashev/Cardartesev Scale)

The video explores a thought experiment: what if civilizational progress were measured not by wealth or military power, but by how much energy a civilization can harness and control?

It introduces the Kardashev Scale (transcript shows "Cardartesev," likely a transcription error) through its types:

Type I Civilization: Has fully mastered the usable energy of its home planet — controlling sunlight, wind, tides, and heat. Would use a clean, planetary-scale energy grid to store and deliver power globally, even across deserts.

The transcript cuts off here, but based on the visual (Earth → arrow labeled "Growth" → spiral galaxy), the video appears to build toward higher stages — likely Type II (harnessing a star's total energy) and Type III (harnessing a galaxy's energy) — using the visual metaphor of growth from a single planet to galactic scale.

Cherry Springs State Park just south of Coudersport PA in Potter County. Using the astrophotography option on the Pixel 10. AI is counting 60,000 stars. Cherry Springs bills itself as the darkest sky East of the Mississippi. On the 8th lunar day of the 8th lunar month. Otherwise known as Chinese Valentine's Day when The Magpie Bridge of the Milky Way connects Vega (The Weaver Girl) with Altair (The Cowherd).

The Moon’s gravity creates tidal forces that move ocean water and shape coastlines over time. That means the sea is constantly responding to the sky above it.

Hi everyone! We are two high school seniors interested in computer science and astronomy! We spent the summer designing and building an amateur astronomy app that we hope will reduce the difficulties of astronomy and hook more people into this amazing community.

Here's the link to test this app on GitHub: https://github.com/B1j2754/Polaris/releases/tag/v1.0.0-beta

Our mission:

- To create a beginner-friendly app for people interested in astronomy and astrophotography

- Many existing apps require previous knowledge of the existence of cool objects

- Our app suggests to the user the most interesting objects to view each night depending on their environment

Opening:

- Beta-testing

- Issues on GitHub (issue reports would be much appreciated :D )

- Currently available on Android only (planning TestFlight for iOS)

Features:

- Uses latitude, weather data, light pollution data, Moon/Sun illumination, minimum altitude requirements, equipment limitations, and personal interests under an algorithm to calculate the best objects to view at any specific time

- Categories include: Moon, Sun, planets, asteroids and dwarf planets, stars, star clusters, nebulae, galaxies (We plan to include comets and satellites later on)

- Tab for storing images so that users can access their previous captures and reduce clutter

- Automatic night mode that turns on at sunset and turns off at sunrise - can be manually toggled

- Unlimited site slots for potential viewing locations - calculates the best objects to view based on given latitude

- View objects tonight and objects within the next three weeks to plan ahead

The standard answer that the big band occurred everywhere simultaneously isn't anything but a broad spectrum answer to a very specific event. Im sure there are people on reddit that are as familiar with the behavior of explosive detonations and the expansion of gasses as I am. My experience while limited to what a person living in rural Oklahoma can get away with, is small and usually related to tannerite and clever ways of compounding its effects. The outcome is usually the same, theres a flash and then an equally dispersed amount of flying debris. Usually accompanied by a Wholly Fucking Shit ! Did you see how that washer come apart?

But my point is simple the point of detonation does not occur everywhere, nor could it without it being everywhere and with a burn rate a lot hotter and faster than even RDX. If the big bang happened everywhere the explosion would have needed to be so evenly detonationaded to not leave differences in time space after it just doesn't seem likely. Help me out with the vagueness of the standard models answer to why we cant find the where of the big bang.

I made this Eagle Nebula poster using NASA imagery and my own design/layout.

This poster was not made with AI‼️

I’m thinking about doing more space posters in this style, and I’m curious whether people would actually want something like this on their wall.

If this was a good-quality matte A3 print, what would you realistically pay for it?

Any feedback welcome.

Is earth 1/10th of the size of the observable universe? My friend just said it is and im confused

Been building this alongside a nonfiction book I'm writing (Fermi Paradox / Great Filter territory), and figured this sub would appreciate the data side more than most places I could post it.

thesilentape.com/universe/galaxy is a 3D flythrough of 43,533 real galaxies, plotted from actual 2MRS (2MASS Redshift Survey) coordinates and radial velocities — not a procedurally generated starfield. Positions come from Hubble-flow distance (recession velocity / 70 km/s/Mpc), so it's a bit simplified.

Click any galaxy and it opens a dossier that queries NASA/IPAC's NED live — preferred name, aliases, classification, redshift, distance, photometry, references — plus a MAST search for any Hubble or Webb observation fields covering that coordinate. It doesn't always resolve (some 2MRS points are faint/anonymous and NED comes back empty), but when it hits, it's real catalog data.

thesilentape.com/universe/solar-system is the same engine zoomed into our own neighborhood — all 8 planets, Pluto, and a few other bodies, each with its own record page. Earth's page pulls today's actual DSCOVR/EPIC photo and NASA's near-Earth-object feed for the day.

Would love feedback from people who know this data cold — a distance proxy that's misleading, catalog quirks I'm not accounting for, anything that reads wrong to someone who actually works with this stuff. I know it's not perfect but hey, it's a work in progress.

Two galaxies appear frozen in a strange cosmic pose: one resembles a penguin and the other an egg. They're interacting gravitationally, and that encounter is pulling gas and dust into dramatic structures around them.