Archive for the ‘physics’ category: Page 2

Dec 27, 2023

Can Machine Learning Predict Chaos? This Paper from UT Austin Performs a Large-Scale Comparison of Modern Forecasting Methods on a Giant Dataset of 135 Chaotic Systems

Posted by in categories: physics, robotics/AI

The science of predicting chaotic systems lies at the intriguing intersection of physics and computer science. This field delves into understanding and forecasting the unpredictable nature of systems where small initial changes can lead to significantly divergent outcomes. It’s a realm where the butterfly effect reigns supreme, challenging the traditional notions of predictability and order.

Central to the challenge in this domain is the unpredictability inherent in chaotic systems. Forecasting these systems is complex due to their sensitive dependence on initial conditions, making long-term predictions highly challenging. Researchers strive to find methods that can accurately anticipate the future states of such systems despite the inherent unpredictability.

Prior approaches in chaotic system prediction have largely centered around domain-specific and physics-based models. These models, informed by an understanding of the underlying physical processes, have been the traditional tools for tackling the complexities of chaotic systems. However, their effectiveness is often limited by the intricate nature of the systems they attempt to predict.

Dec 27, 2023

Discovery of Two Planetary Systems around Sun-like Stars

Posted by in categories: physics, space

A study published today (Dec. 15) in the journal Astronomy & Astrophysics reveals the discovery of two new planetary systems orbiting stars similar to our sun, also known as solar analogs.

The study was led by Dr. Eder Martioli, a full researcher at the Laboratório Nacional de Astrofísica (LNA/MCTI) and an associate researcher at the Institut d’astrophysique de Paris (IAP), and by Dr. Guillaume Hébrard, a researcher at the Institut d’astrophysique de Paris (IAP).

Observations responsible for detecting these two systems, named TOI-1736 and TOI-2141, were conducted using NASA’s TESS space telescope and the SOPHIE spectrograph installed on the 1.93 m telescope at the Observatoire de Haute-Provence (OHP) in southern France, both illustrated in Figure 1.

Dec 27, 2023

What Happens Inside a Proton?

Posted by in categories: cosmology, media & arts, physics

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Dec 27, 2023

Physicists Designed an Experiment to Turn Light Into Matter

Posted by in categories: information science, physics

It would be a tangible demonstration of Einstein’s famous E = mc^2 equation.

Dec 27, 2023

Physicists Have Finally Cracked Stephen Hawking’s Famous Black Hole Paradox

Posted by in categories: cosmology, physics, space travel

News space, astronomy, NASA, spacex, astrophysics, sun, moon.

Dec 26, 2023

Scientists Hope That Their Discovery About Black Holes is a Mistake. Here is What They Discovered

Posted by in categories: cosmology, physics, space travel

News space, astronomy, NASA, spacex, astrophysics, sun, moon.

Dec 26, 2023

Humans could use black holes as batteries, physics paper claims. Here’s how

Posted by in categories: cosmology, physics

Black holes are some of the most powerful objects in the universe — and humans could devise ways to harness that power as an energy source, a new theoretical study claims.

Dec 26, 2023

Unlocking The Mystery Of 137: Why This Number Is So Important

Posted by in category: physics

A s the mathematician De La Soul famously stated, three is the magic number. But if physicist Richard Feynman is to be believed, that figure is off by a factor of about 400. For Feynman, you see, the “magic number” is around 1/137 – specifically, it’s 1/137.03599913.

Physicists know it as α, or the fine structure constant. “It has been a mystery ever since it was discovered,” Feynman wrote in his 1985 book QED: The Strange Theory of Light and Matter. “All good theoretical physicists put this number up on their wall and worry about it.”

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Dec 26, 2023

Unexpected Chemistry reveals Cosmic Star Factories´ Secrets

Posted by in categories: chemistry, physics, space

Two galaxies in the early universe, which contain extremely productive star factories, have been studied by a team of scientists led by Chalmers University of Technology in Sweden. Using powerful telescopes to split the galaxies’ light into individual colours, the scientists were amazed to discover light from many different molecules – more than ever before at such distances. Studies like this could revolutionise our understanding of the lives of the most active galaxies when the universe was young, the researchers believe.

When the universe was young, galaxies were very different from today’s stately spirals, which are full of gently-shining suns and colourful gas clouds. New stars were being born, at rates hundreds of times faster than in today’s universe. Most of this however, was hidden behind thick layers of dust, making it a challenge for scientists to discover these star factories’ secrets – until now. By studying the most distant galaxies visible with powerful telescopes, astronomers can get glimpses of how these factories managed to create so many stars.

In a new study, published in the journal Astronomy & Astrophysics, a team of scientists led by Chalmers astronomer Chentao Yang, used the telescopes of NOEMA (NOrthern Extended Millimetre Array) in France to find out more about how these early star factories managed to create so many stars. Yang and his colleagues measured light from two luminous galaxies in the early universe – one of them classified as a quasar, and both with high rates of star formation.

Dec 26, 2023

Einstein’s Insight: Why Does Gravity Pull Us Down and Not Up?

Posted by in categories: energy, physics, space

Gravity is the reason things with mass or energy are attracted to each other. It is why apples fall toward the ground and planets orbit stars.

Magnets attract some types of metals, but they can also push other magnets away. So how come you feel only the pull of gravity?

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