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Category: physics – Page 322

For The First Time, Physicists Have Observed a Giant Magnetic ‘Bridge’ Between Galaxies

For the first time, scientists have detected evidence of a magnetic field that’s associated with the vast intergalactic ‘bridge’ that links our two nearest galactic neighbours.

Known as the Magellanic Bridge, the bridge is a huge stream of neutral gas that stretches some 75,000 light-years between our two neighbouring galaxies, the Large and Small Magellanic Clouds (LMC and SMC). Although researchers had predicted it was there, this is the first observation of its magnetic field, and it could help us understand how these vast bridges come to be.

“There were hints that this magnetic field might exist, but no one had observed it until now,” said lead researcher, Jane Kaczmarek from the University of Sydney.

NASA’S STUNNING BREAKTHROUGH: It’s First Warp Drive…Is a TRUE Mindblower!

A few months ago, physicist Harold White shocked the aeronautics industry when he announced that his team at NASA was in the process of developing a faster-than-light warp drive. His design could one day transport a spacecraft to the nearest star in a matter of weeks.

The idea originally came to White while he was considering an equation formulated by physicist Miguel Alcubierre in his 1994 paper titled, “The Warp Drive: Hyper-Fast Travel Within General Relativity. Alcubierre suggested a mechanism by which space-time could be “warped” and behind a spacecraft.

Michio Kaku dubbed Alcubierre’s theory a “passport to the universe,” which harnesses a quirk in the “cosmological code” that allows for the expansion and contraction of space-time. If proven true, it could allow for hyper-fast travel between interstellar destinations. In order to accomplish this, the starship would need able to expand the space behind it rapidly to push it forward. For passengers, it would look like a lack of acceleration.

Scientists are waging a war against human aging. But what happens next?

Aubrey de Grey in this new interview with Vox.

We all grow old. We all die.

For Aubrey de Grey, a biogerontologist and chief science officer of the SENS Research Foundation, accepting these truths is, well, not good enough. He decided in his late twenties (he’s currently 54) that he “wanted to make a difference to humanity” and that battling age was the best way to do it. His life’s work is now a struggle against physics and biology, the twin collaborators in bodily decay.

“I understand it takes a certain amount of guts to aim high.” —Aubrey de Grey.

Physicists Just Came Up With a Mathematical Model for a Viable Time Machine

Physicists have come up with what they claim is a mathematical model of a theoretical “time machine” — a box that can move backwards and forwards through time and space.

The trick, they say, is to use the curvature of space-time in the Universe to bend time into a circle for hypothetical passengers sitting in the box, and that circle allows them to skip into the future and the past.

“People think of time travel as something as fiction. And we tend to think it’s not possible because we don’t actually do it,” says theoretical physicist and mathematician, Ben Tippett, from the University of British Columbia in Canada.

‘Negative mass’ created at Washington State University

We are one step closer to actually creating an Alcuberre FTL drive…

Experimental images of an expanding spin-orbit superfluid Bose-Einstein condensate at different expansion times (credit: M. A. Khamehchi et al./Physical Review Letters)

Washington State University (WSU) physicists have created a fluid with “negative mass,” which means that if you push it, it accelerates toward you instead of away, in apparent violation of Newton’s laws.

The phenomenon can be used to explore some of the more challenging concepts of the cosmos, said Michael Forbes, PhD, a WSU assistant professor of physics and astronomy and an affiliate assistant professor at the University of Washington. The research appeared Monday (April 17, 2017) in the journal Physical Review Letters.

A naked singularity: Can we spot the most extreme object in the universe?

A team of scientists at the Tata Institute of Fundamental Research (TIFR), Mumbai, India, have found new ways to detect a bare or naked singularity, the most extreme object in the universe.

When the fuel of a very massive star is spent, it collapses due to its own gravitational pull and eventually becomes a very small region of arbitrarily high matter density, that is a ‘Singularity’, where the usual laws of physics may breakdown. If this singularity is hidden within an event horizon, which is an invisible closed surface from which nothing, not even light, can escape, then we call this object a black hole.

In such a case, we cannot see the singularity and we do not need to bother about its effects. But what if the event horizon does not form? In fact, Einstein’s theory of general relativity does predict such a possibility when massive stars collapse at the end of their life-cycles. In this case, we are left with the tantalizing option of observing a naked singularity.

Physicists create mind-bending ‘negative mass’ that accelerates backwards and could help explain black holes

Scientists have created a fluid with “negative mass” which they claim can be used to explore some of the more challenging concepts of the cosmos.

Washington State University physicists explained that this mass, unlike every physical object in the world we know, accelerates backwards when pushed.

The phenomenon, which is rarely created in laboratory conditions, shows a less intuitive side of Newton’s Second Law of Motion, in which a force is equal to the mass of an object times its acceleration (F=ma).

‘Negative mass’ created for the first time

Washington State University physicists have created a fluid with negative mass, which is exactly what it sounds like. Push it, and unlike every physical object in the world we know, it doesn’t accelerate in the direction it was pushed. It accelerates backwards. The phenomenon is rarely created in laboratory conditions and can be used to explore some of the more challenging concepts of the cosmos, said Michael Forbes, a WSU assistant professor of physics and astronomy and an affiliate assistant professor at the University of Washington. The research appears today in the journal Physical Review Letters, where it is featured as an “Editor’s Suggestion.” Hypothetically, matter can have negative mass in the same sense that an electric charge can be either negative or positive.

Affordable deep space missions using asteroids

Phase 1 work demonstrated Optical Mining in the laboratory and performed mission and systems analysis of the application of Optical Mining to human exploration missions. Their mission analysis showed that the most accessible Near Earth Objects (NEOs) can be used to provide NASA with mission consumables for human exploration in deep space with the potential of saving up to $10 billion per year or $150 billion over the 15 year operational life cycle of a human exploration program. This savings alone would be enough to transform NASA’s vision of human exploration from being unaffordable to being affordable within budgets that Congress can approve. Phase 1 technical work included a full scale (8 kW) Optical Mining demonstration using a high fidelity CI-type asteroid simulant in vacuum using sunlight from a 10 meter diameter solar concentrator without mechanical contact or downforce. This work confirmed our physics based mathematical model of the excavation and volatile extraction process and scalability of results from 36 prior, small scale (≈ 1 cm diameter) demonstrations and tests.

Phase 2 work will complete mission and system analysis of the application of Optical Mining to an exciting program of human exploration and we will mature the technology of Optical Mining to the point at which NASA can baseline this approach for an affordable program of human exploration. Our mission studies will address the production via Optical Mining missions to extract and retrieve resources, consumable processing, storage, and application of consumables to human exploration mission in cislunar, NEO and Martian space. The mission studies will be tightly coupled with our laboratory work. Laboratory work will include the development and integration of a 30 kW Optical Mining test apparatus in our laboratory and integration with our high quality vacuum chamber for a test program involving Optical Mining.