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Category: cosmology – Page 125

The latest evidence comes from a yet-to-be-peer-reviewed analysis of gamma-ray emission. The data is publicly available and it was used by researchers at the National Autonomous University of Mexico to create a timeline of emission from June 2022 to December 2022. The data is from NASA’s Fermi Gamma-ray Space Telescope. The team found a repeating emission, appearing every 76.32 minutes.

The light curve shows the repeating pattern clearly, and the period is consistent with observations from last year in a completely different wavelength. Radio observations also suggested that something is going around Sagittarius A* about every 74 minutes, with an uncertainty of 6 minutes higher or lower.

Sagittarius A*’s radius is 12 million kilometers (7.4 miles) and this object is expected to be fairly close to it, five times the black hole radius. To cover the orbital distance in just over an hour, the blob needs to travel at 30 percent of the speed of light, truly an impressive velocity.

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Supermassive black holes reside in some of the biggest galaxies in the universe. They tend to be billions of times more massive that our Sun, and not even light itself can escape a black hole once it gets too close.

But it’s not all darkness. Supermassive black holes power some of the most luminous celestial objects in the universe – active galactic nuclei, which shine across the spectrum of light, including radio waves.

The active galactic nucleus in nearby galaxy Messier 87 is a prodigious emitter of radio waves, 27 orders of magnitude more powerful than the most powerful radio transmitters on Earth.

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Dr. McKinney noted, “With JWST, we can study for the first time the optical and infrared properties of this heavily dust-obscured, hidden population of galaxies because it’s so sensitive that not only can it stare back into the farthest reaches of the universe, but it can also pierce the thickest of dusty veils.”

Did galaxies produce stars in the early universe? This is what a recent study published in The Astrophysical Journal hopes to unveil as a team of international researchers analyze data from NASA’s James Webb Space Telescope (JWST) about a star-forming galaxy called AzTECC71 that existed approximately 900 million years after the Big Bang. What makes this discovery unique is that AzTECC71 is hidden behind a fair amount of dust which initially fooled astronomers to hypothesize that it’s not very big. How astronomers now hypothesize that AzTECC71 was producing a plethora of new stars despite its young age, which challenges previous notions of the formation and evolution of galaxies so soon after the Big Bang.

Color composite image of the galaxy, AzTECC71, which astronomers estimate existed approximately 900 million years after the Big Bang. This image was made using multiple color filters as part of the James Webb Space Telescope’s NIRCam instrument. (Credit: J. McKinney/M. Franco/C. Casey/University of Texas at Austin)

“This thing is a real monster,” said Dr. Jed McKinney, who is a postdoctoral researcher at The University of Texas at Austin and lead author of the study. “Even though it looks like a little blob, it’s actually forming hundreds of new stars every year. And the fact that even something that extreme is barely visible in the most sensitive imaging from our newest telescope is so exciting to me. It’s potentially telling us there’s a whole population of galaxies that have been hiding from us.”

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More stable clocks could measure quantum phenomena, including the presence of dark matter.

A new MIT study finds that even if all noise from the outside world is eliminated, the stability of clocks, laser beams, and other oscillators would still be vulnerable to quantum mechanical effects.

Clocks, lasers, and other oscillators could be tuned to super-quantum precision, allowing researchers to track infinitesimally small differences in time, according to a new MIT study.

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In the basement of Kirchhoff-Institut für Physik in Germany, researchers have been simulating the Universe as it might have existed shortly after the Big Bang. They have created a tabletop quantum field simulation that involves using magnets and lasers to control a sample of potassium-39 atoms that is held close to absolute zero. They then use equations to translate the results at this small scale to explore possible features of the early Universe.

The work done so far shows that it’s possible to simulate a Universe with a different curvature. In a positively curved universe, if you travel in any direction in a straight line, you will come back to where you started. In a negatively curved universe, space is bent in a saddle shape. The Universe is currently flat or nearly flat, according to Marius Sparn, a PhD student at Kirchhoff-Institut für Physik. But at the beginning of its existence, it might have been more positively or negatively curved.

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Dark, mysterious and consuming everything around them, black holes will rip apart anything that passes their event horizons. But could there be more? What would happen if you fell into one of those monstrosities? How could you possibly travel through the black hole itself? And if you emerged on the other side, where would you end up?

Transcript and sources: https://whatifshow.com/travelling-through-a-black-hole/

00:00 What If You Traveled Through a Black Hole?
00:47 What’s a black hole?
02:04 Crossing a charged black hole.
02:49 A mind blowing experience.
04:35 Reaching the inner horizon.
05:35 Witnessing the history of the universe.
07:24 Following different laws of physics.

Questions or concerns? Contact us at https://underknown.com/contact/

Get our 100 best episodes in one mind-blowing book: http://bit.ly/ytc-the-what-if-100-book.

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What would the outcome be if you took a leap of faith straight into a black hole? We looked to Einstein and Hawking to ponder the scenario.

Say one day you were exploring space looking for a new planet for humans to inhabit, but came across a black hole and decided – why not check it out? Would you have any chance of survival? How would you get out if at all? Would you find a shortcut to another universe? Watch the video to learn about what would happen if you fell into a black hole.

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Source and more: https://insh.world/science/diving-into-a-black-hole-adventure-or-an-abyss/

Watch more what-if scenarios:
Planet Earth: https://www.youtube.com/watch?v=_-HhCwYD7rc&list=PLZdXRHYAVx…Yq9N9wyb2l.
The Cosmos: https://www.youtube.com/watch?v=gfuJyVkMH_g&list=PLZdXRHYAVx…wXNGYHmE8U
Technology: https://www.youtube.com/watch?v=CS3bBO05fpU&list=PLZdXRHYAVx…qSEB7kDdKO
Your Body: https://www.youtube.com/watch?v=QmXR46TrbA8&list=PLZdXRHYAVx…2ySsHj8GZO
Humanity: https://www.youtube.com/watch?v=fdCDQIyXGnw&list=PLZdXRHYAVx…t8zFxSCSvZ

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Continue reading “What If You Fell Into a Black Hole?” | >