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A levitating microparticle is observed to recoil when a nucleus embedded in the particle decays—opening the door to future searches of invisible decay products.

For centuries, physicists have exploited momentum conservation as a powerful means to analyze dynamical processes, from billiard-ball collisions to galaxy formation to subatomic particle creation in accelerators. David Moore and his research team at Yale University have now put this approach to work in a new setting: they used momentum conservation to determine when a radioactive atom emitted a single helium nucleus, known as an alpha particle (Fig. 1) [1]. The demonstration suggests that—with further improvements—researchers might be able to use this technique to detect other nuclear-decay products, such as neutrinos and hypothetical dark-matter particles (see also Special Feature: Sensing a Nuclear Kick on a Speck of Dust).

The basic idea is simple: if the radioactive atom is embedded in a larger object, then an outgoing decay product will exert a backreaction on that object, causing it to recoil in the opposite direction. But is it really possible to detect the recoil kick from a particle as small as a helium nucleus? The answer lies in how precisely we can measure the larger object’s momentum. One of the main limitations is friction: if the larger object is slowed down by frictional forces, then its motion won’t reflect the impulse from the decaying particle.

WASHINGTON — The Defense Advanced Research Projects Agency (DARPA) has selected the startup Scout Space to participate in the BRIDGES (Bringing Classified Innovation to Defense and Government Systems) consortium.

BRIDGES, launched by DARPA in 2023, aims to connect innovative small companies and nontraditional defense contractors with classified Department of Defense research and development efforts. The initiative seeks to bridge the gap between cutting-edge commercial technologies and classified defense needs, particularly in areas considered critical to maintaining U.S. military superiority.

Scout Space, based in Reston, Virginia, develops satellite flight software and space domain awareness sensors. The company announced July 8 it was selected by DARPA for its proposal outlining an approach to “advancing autonomous in-space threat response.”

TAMPA, Fla. — Mandala Space Ventures, a Californian venture studio and incubator, announced July 8 the nine United Kingdom-based startups participating in its UK Space Agency-funded accelerator program this fall.

The eight-week virtual course starts Sept. 3 and culminates with an in-person investor pitch day at the California Institute of Technology (Caltech) in Pasadena, California.

The SoCal-UK Space Accelerator creates a “transatlantic portal for great ideas from the U.K.,” said Mandala founder and CEO Leon Alkalai, helping prepare them for venture capital and access to the U.S. market.

Mind-blowing experiments are bringing ancient cosmic conditions into modern labs.

A team of astronomers has identified a temperate exoplanet as a promising super-Earth ice or water world.

The findings, led by Université de Montréal, show that the habitable zone exoplanet, LHS 1,140 b, is not likely a mini-Neptune, a small so-called gas giant—large planets composed mostly of gas—with a thick hydrogen-rich atmosphere. The planet, located about 48 light-years away in the constellation Cetus, emerges as one of the most promising habitable zone exoplanet candidates known, potentially harboring an atmosphere and even a liquid water ocean.

Data from the James Webb Space Telescope (JWST) were collected in December 2023 and added to previous data from other space telescopes Spitzer, Hubble, and TESS to solidify this result, accepted for publication in The Astrophysical Journal Letters this week and currently available on the arXiv preprint server.

The night sky has a visiting comet flaunting its faint tail for stargazers this summer.

The comet 13P/Olbers will make its closest approach to Earth later this month, according to NASA’s Jet Propulsion Laboratory.

The comet orbits the sun every 25,400 days. That’s about every 70 years – 69.54 to be exact. It was last be seen from Earth in 1956.

It’s a crucial step forward in the quest for clean energy.

Mechanical systems are highly suitable for realizing applications such as quantum information processing, quantum sensing and bosonic quantum simulation. The effective use of these systems for these applications, however, relies on the ability to manipulate them in unique ways, specifically by ‘squeezing’ their states and introducing nonlinear effects in the quantum regime.

A research team at ETH Zurich led by Dr. Matteo Fadel recently introduced a new approach to realize quantum squeezing in a nonlinear mechanical oscillator. This approach, outlined in a paper published in Nature Physics, could have interesting implications for the development of quantum metrology and sensing technologies.

“Initially, our goal was to prepare a mechanical squeezed state, namely a quantum state of motion with reduced quantum fluctuations along one phase-space direction,” Fadel told Phys.org. “Such states are important for quantum sensing and quantum simulation applications. They are one of the gates in the universal gate set for quantum computing with continuous-variable systems—meaning mechanical degrees of freedom, electromagnetic fields, etc., as opposed to qubits that are discrete-variable systems.”

This 2D cooling system can deliver 100mK temperatures.