A group of physicists at the University of São Paulo’s Institute of Physics has proposed a model of the behaviour of dark matter (DM) in the presence of dark energy (DE) that is compatible with current astronomical observations. A model of inelastic DM can be realised from light-weight particles, which are collectively interacting through the massive vector mediator, and the model is an alternative explanation for DM relics in the universe. Importantly, this framework may have the potential to circumvent the experimental hurdles for the detection of DM that have thus far kept it in the dark. The findings are published in the Journal of High Energy Physics, and its authors believe it has the potential to “revolutionise” how particle physics analyses are conducted in the future.

Light Mediator ZQ Offers New Clues to Elusive Dark Matter and Its Cosmic Origins

As per the users’ report, they have developed the following new model: a heavy, stable DM from a light, unstable one. This can be expressed as a heavy stable DM due to a heavy unstable one, which may give rise to the “thermal freeze-out” in the universe. It doesn’t just interact with visible matter but with dark matter as well, and that’s how you get the new observational windows.

To explain why the dark matter has not been observed until now, the model further involves a decay of the unstable dark matter χ2 to some species not disturbing the CBR, and thus also not presenting a visible/observable decay signal. The picture is consistent with current astrophysical and experimental constraints, avoiding simpler `vanilla’ DM scenarios.

ZQ-induced vector mediators are light portals connecting the two sectors and may mediate the direct interactions between the dark sector and the SM particles. The black line indicates the region in the parameter space where dark matter can be hiding unobserved — this is to be addressed in future experiments.

The study suggests the search for dark matter should pivot from the “discovery frontier”, in which exquisitely sensitive instruments scan for signals, to the “intensity frontier”, which seeks ever-finer measurements to tease out anomalies. Future experiments will seek to dig more deeply into these unexplained corners of particle physics with a new online tool.

In the latest edition of the scientific investigations, it has come to light that the Chandra X-Ray Observatory of NASA has been employed by an international team of astronomers to investigate a supergiant star called Wd1-9. It has certainly performed a detailed investigation, which was accompanied by in-depth analysis and offered essential insights. Considering the supergiant B Stars, these are quite rare in the Milky Way. As these stars grow, they undergo continuous changes. These stars also exhibit strong Balmore emission lines, forbidden lines, and infrared excess.

Wd1-9: What is this Supergiant B Star?

Wd1-9 is a supergiant B (e) star in Westerlund 1. It is located at a distance of 13,800 light years from Earth. This star is the brightest radio source present within the cluster. Likewise, the recent findings presented in the paper published on July 23rd, 2025, suggest that this star displays a rich emission-line spectrum. Significantly, no photospheric features were detected.

Although Wd1-9 has been studied multiple times at different wavelengths, its true nature is still unknown due to it being covered by a cloud of dust. As the previous research suggests, this star may be a cool hypergiant or an interacting binary system. Now, to overcome these suspicions, Konstantina Anastasopolou led a team of the Harvard-Smithsonian Center for Astrophysics (CfA), Cambridge, employed Chandra to dig deeper.

What did the Astronomers Find?

As per the observations offered by Chandra, it was witnessed that Wd1-9 exhibits long-term X-ray variability. The team further identified an orbital period that comprised a 14-day periodic signal. According to the astronomers, this is the first period determination for the Wd1-9.

Significantly, the astronomers found that strong emission lines were detected that surfaced from elements like silicon, sulfur, and argon. Similarly, the iron emission line at 6.7 keV was identified for the first time ever. These identifications have become a part of the new findings.

To Conclude

According to the astronomers, the above-specified findings directly relate to binarity. The spectrum of Wd1-9 resembles the Wolf-Rayet (WR) binaries in Westerlund 1. Also, when the astronomers examined the X-Ray color-color diagrams, they identified that Wd1-9 showcased variations in thermal temperatures. After analysing the findings and putting all the examinations together, the scientists concluded that Wd1-9 is a part of the binary system.

Recently, Australia has launched its first Eris Rocket Skyward; however, in no time, it didn’t get very far. But the history has been recorded in the books. The country has launched its own orbital that was entirely crafted within the country. The company Gilmour Space achieved the milestone on July 29th, 2025, when it sent its first Eris rocket into the sky. It took the flight from the Bowen Orbital Spaceport in coastal Queensland at 6:35 p.m. EDT (8:30 am local time in Australia).

How Did The Failure Occur?

As the liftoff commenced, the Eris couldn’t get far, and the rocket began to slide sideways. It soon rose off the pad and within a span of 14 seconds, crashed back to the Earth. This crash was best compared with that of the third orbital launch attempt enforced by Astra (California) in the year 2021. Although Gilmour Space was not entirely relying on the success.

Dating back to February, the Gilmour company stated, “Whether we make it off the pad, reach max Q, or get all the way to space, what’s important is that every second of the flight will deliver valuable data that will improve our rocket’s reliability and performance for future launches”. Significantly, post-launch, they issued a statement narrating that it is a big step for launch and that they have their eyes on it. Also, there were no injuries reported or other environmental impacts during the launch.

Behind the Scenes of Orbital Launch: The Plans and Execution

The orbital launch, which occurred on July 29th, 2025, was previously aimed to be executed in May; however, due to Tropical Cyclone Alfred, the Gilmour Space had to postpone it. Soon after the cyclone cleared, the company targeted the launch in mid-May, but could not proceed due to a technical issue, where the rocket’s payload fairing failed suddenly. As stated by Gilmour Space, the issue was caused due to a power surge.

After fixing the technical issues, the company again planned the launch for June. But, as Gilmour Space operates north of the town of Bowen, the winds did not fit well, and due to unfavourable weather, the launch was rescheduled for later. Finally, in July, it went off air.

To Conclude

Gilmour Space was founded by Adam Gilmour and James Gilmour. This brother duo aims to reach heights in the area of spaceflight. Not only is Eris their focus, but they have also invented satellites. The launch was a big attempt for the country, and such advancement was a big breakthrough in over 50 years.