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Archive for the ‘cosmology’ category: Page 4

May 22, 2022

Rapidly descending dark energy and the end of cosmic expansion

Posted by in categories: cosmology, quantum physics

Although the universe is expanding at an accelerating rate today, this paper presents a simple mechanism by which a dynamical form of dark energy (known as quintessence) could cause the acceleration to come to end and smoothly transition from expansion to a phase of slow contraction. That raises questions, How soon could this transition occur? And at what point would it be detectable? The conclusions are that the transition could be surprisingly soon, maybe less than 100 million y from now, and yet, for reasons described in the main text, it is not yet detectable today. The scenario is not far-fetched. In fact, it fits naturally with recent theories of cyclic cosmology and conjectures about quantum gravity.

May 21, 2022

NASA InSight shutting down and more: Understand the world through 9 images

Posted by in category: cosmology

NASA is being forced to end its Mars lander mission early because of dust.


NASA’s InSight Mars lander is shutting down after four years and scientists have seen our galaxy’s black hole for the first time. Here’s May 11–18 in science images.

Continue reading “NASA InSight shutting down and more: Understand the world through 9 images” »

May 21, 2022

Remains of a slamming between two galaxies could shed light upon dark matter

Posted by in categories: cosmology, physics

May 20, 2022

NASA releases eerie ‘singing’ from a black hole and it’s straight out of a horror movie

Posted by in categories: cosmology, media & arts

Discover Music.

Vangelis.

May 19, 2022

New picture answers many questions about our galaxy’s black hole — and reveals some mysteries

Posted by in category: cosmology

The recently-released image shows how Sagittarius A is both mundane and very strange, all at once.

May 17, 2022

How could we find a wormhole hiding in the Milky Way?

Posted by in categories: cosmology, physics

If there was a wormhole in the center of our galaxy, how could we tell? Two physicists propose that carefully watching the motions of a star orbiting the Milky Way’s supermassive black hole might help scientists start to check. The researchers published the idea in a recent paper in the journal Physical Review D.

A wormhole is a hypothetical concept that connects two separate areas of space-time. Wormholes often appear in science fiction narratives like the 2014 film Interstellar as a convenient way to get from point A to point B in the vast universe. Physicists have many theories that describe how wormholes might behave, if they exist, but haven’t yet found any.

May 17, 2022

NASA’s Goddard Space Flight Center

Posted by in category: cosmology

Hello darkness, my old friend 🎵

Want to listen to a black hole? The black hole at the center of the Perseus galaxy cluster sends out pressure waves that ripple the cluster’s gas, which we can translate into a note. #BlackHoleWeek https://go.nasa.gov/3MQae1I

May 17, 2022

Physicists Found a Way to Trigger The Strange Glow of Warp Speed Acceleration

Posted by in categories: cosmology, physics

Every time you take a step, space itself glows with a soft warmth.

Called the Fulling–Davies–Unruh effect (or sometimes just Unruh effect if you’re pushed for time), this eerie glow of radiation emerging from the vacuum is akin to the mysterious Hawking radiation that’s thought to surround black holes.

Only in this case, it’s the product of acceleration rather than gravity.

Continue reading “Physicists Found a Way to Trigger The Strange Glow of Warp Speed Acceleration” »

May 16, 2022

Black hole science enters its golden age

Posted by in categories: cosmology, science

The idea of black holes have been around for over 200 years. Today, we’re seeing them in previously unimaginable ways.

May 16, 2022

Distant quasars reveal a surprising fact about the first black holes

Posted by in category: cosmology

A new analysis of the early universe shows quasars with growth capped by surrounding matter.

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