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Archive for the ‘cosmology’ category: Page 149

Mar 8, 2023

Nearby active galaxy investigated with Chandra observatory

Posted by in category: cosmology

Using NASA’s Chandra X-ray observatory, astronomers have performed deep X-ray observations of a nearby active galaxy known as NGC 5,728 and its active galactic nucleus (AGN). Results of the observational campaign, published March 1 on the pre-print server arXiv, deliver important information regarding the properties of this AGN and the emission from it.

AGN are compact regions at the center of a galaxy, more luminous than the surrounding galaxy light. They are very energetic due either to the presence of a black hole or activity at the core of the galaxy.

Located some 146 million light years away in the constellation of Libra, NGC 5,728 is an active barred spiral galaxy with a size of nearly 100,000 light years and an estimated mass of about 72 billion solar masses. It is a Seyfert galaxy of type 1.9, with a heavily obscured and complex AGN powered by a (SMBH) at its center.

Mar 8, 2023

Black Holes Will Destroy All Quantum States, Researchers Argue

Posted by in categories: cosmology, quantum physics

New calculations suggest that the event horizons around black holes will ‘decohere’ quantum possibilities — even those that are far away.

Mar 8, 2023

How Star Trek inspired modern tech—smart phones, touch panels, VR

Posted by in categories: computing, cosmology, mobile phones, virtual reality

The most famous one is the cell phone itself: Captain Kirk’s communicator inspired the folks at Motorola to make the first handheld mobile device in 1973. Star Trek: The Original Series (popularly called TOS) from the 1960s also inspired video conferencing. But things started to amp up when, in 1987, Star Trek: The Next Generation (aka TNG) hit the floors, with Sir Patrick Stewart in the lead. It became one of the most syndicated shows on television—which is how I discovered it in mid-90s India on the Star network. It fundamentally impacted my life, inspiring me to become the technology writer I am today.

But more than me, this show heralded more technological concepts that are becoming increasingly real. The LCARS computer on the Galaxy-Class USS Enterprise D is basically the foundation of what Google is today. Google’s former head of search, Amit Singhal, often said that the company is “trying to build the Star Trek computer”.

Mar 8, 2023

More speculations on superfluid vacuum physics and theology

Posted by in categories: cosmology, quantum physics

I recently speculated on a toy model for scientific theology, with superintelligent God-like entities that live in the bare quantum vacuum. More speculations below.

This is not (yet) science — it’s far too vague and speculative to be called that — or theology. Call it science fiction (or “religion fiction” in the sense explored in my article “Religion Fiction Inspires Real Religion”) without the fiction. I guess I should write a science fiction story as a container for these speculations.

Therefore, I’ll often refer to superfluid vacuum theory (SVT) as “Cooper-Hofstadter theory” — a SVT that was featured in “The Big Bang Theory” TV show, of all things! Also, I guess Sheldon Cooper is more known than Leon Cooper.

Mar 8, 2023

Strange rebels

Posted by in categories: cosmology, quantum physics, robotics/AI

I recently read an interesting book on reality, entitled The Fabric of Reality. In the book, David Deutsch constructs a unified theory of reality by combining four fundamental theories: 1. Quantum mechanics (multiverse interpretation). 2. Turing principle of computers and artificial intelligence. 3. Popperian epistemology. 4. Darwinian evolution. Deutsch says: In all cases the theory […].

Mar 7, 2023

In a first, scientists record shockwaves in the cosmic web

Posted by in categories: cosmology, mapping

First evidence of magnetic fields in the Universe’s galactic web.

The cosmic web is the name astronomers give to the structure of our Universe. It refers to the clusters, filaments, dark matter, and voids that make up the basis of this ever-expanding Universe. We can observe this via optical telescopes by mapping the locations of galaxies.

In a new research published in Science Advances, for the first time, scientists claim to have observed shockwaves moving through these galaxy clusters and filaments that make up the galactic or cosmic web. A phenomenon that has long been a universal mystery.

Mar 7, 2023

How Humans Could Go Interstellar, Without Warp Drive

Posted by in categories: cosmology, economics, information science, space travel

The field equations of Einstein’s General Relativity theory say that faster-than-light (FTL) travel is possible, so a handful of researchers are working to see whether a Star Trek-style warp drive, or perhaps a kind of artificial wormhole, could be created through our technology.

But even if shown feasible tomorrow, it’s possible that designs for an FTL system could be as far ahead of a functional starship as Leonardo da Vinci’s 16th century drawings of flying machines were ahead of the Wright Flyer of 1903. But this need not be a showstopper against human interstellar flight in the next century or two. Short of FTL travel, there are technologies in the works that could enable human expeditions to planets orbiting some of the nearest stars.

Certainly, feasibility of such missions will depend on geopolitical-economic factors. But it also will depend on the distance to nearest Earth-like exoplanet. Located roughly 4.37 light years away, Alpha Centauri is the Sun’s closest neighbor; thus science fiction, including Star Trek, has envisioned it as humanity’s first interstellar destination.

Mar 7, 2023

Fred Hoyle: “I don’t believe in the Big Bang”

Posted by in category: cosmology

Sir Fred Hoyle was an English astronomer who formulated the theory of stellar nucleosynthesis. He also held controversial stances on other scientific matters — in particular his rejection of the “Big Bang” theory, a term coined by him on BBC radio, and his promotion of panspermia and the Steady-state theory of the universe.

Mar 7, 2023

Scientists Glimpse Faint Shocks in Cosmic Web that Links the Universe

Posted by in category: cosmology

Over time, clumps of dark matter began to gravitationally pull in regular matter, forming recognizable structures, such as galaxies. Galaxies, in turn, coalesced together into massive galaxy clusters that are linked across huge stretches of space by filaments of dark matter, creating what is now known as the cosmic web.

For years, scientists have speculated that magnetic fields within the cosmic web would help to produce shocks that might glow dimly in radio light. Now, for the first time, astronomers have captured this “predicted emission from the formation and growth of the large-scale structure of the Universe,” according to a recent study in Science Advances.

Mar 7, 2023

A mysterious object is being sucked into our galaxy’s black hole. Now, we may know what it is

Posted by in category: cosmology

A strange blob has been seen rapidly circling our galaxy’s central black hole. Now, astronomers have identified it as the exploded debris from two merging stars.