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A supposed “planet nine” that lies hidden at the edge of our solar system could actually be something else entirely, according to scientists. The unexplained movement of objects at the edge of our solar system has led some to propose that they are being influenced by another world, hidden in the dark distance of our planetary neighbourhood, that they have referred to as planet nine. Objects at the far reaches of the solar system behave as if they are being pulled around by an object that we cannot see, which is probably another planet, they suggest. But a new study by researchers Harsh Mathur, a professor of physics at Case Western Reserve University, and Katherine Brown, an associate professor of physics at Hamilton College, say that those movements are instead the result of a modified law of gravity. The scientists plotted what would happen if the objects were being governed by a theory known as Modified Newtonian Dynamics or MOND. That suggests that Newton’s usual gravity only works up to a point – that in the outer regions of galaxies, for instance, gravity behaves in unusual ways. They found that the data lined up, and applying the MOND theory to the existing observations seemed to predict them exactly. “The alignment was striking,” said Professor Mathur. They note that the findings do not necessarily rule out planet nine – or another explanation for what is going on. Some researchers have suggested other explanations for what the objects could be, for instance, while others have suggested that the claimed effect is just the result of when the distant objects tend to be observed. “Regardless of the outcome, this work highlights the potential for the outer solar system to serve as a laboratory for testing gravity and studying fundamental problems of physics,” said Professor Brown. The findings are reported in a paper, ‘Modified Newtonian Dynamics as an Alternative to the Planet Nine Hypothesis’, published in The Astronomical Journal. Read More Watch live: Amazon launches first internet satellites aiming to rival Starlink Stargazing in October: A sleeping giant Prada to design Nasa’s next-gen space suits for Artemis astronauts

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Four volunteers have entered a simulated Mars habitat as part of a year-long Nasa experiment to test astronauts’ resilience to isolation and other psychological stress factors. The CHAPEA (Crew Health and Performance Exploration Analog) mission will see the participants live and work in a 158-square-metre (1,700-square-foot) habitat at Nasa’s Johnson Space Center in Houston, Texas. It is the first of three one-year simulated Mars missions, which each aim to assess the health and performance of crew members when living in confinement with limited resources. Participants will take part in simulated spacewalks, science experiments and habitat maintenance, while also attempting to grow crops for food. “The simulation will allow us to collect cognitive and physical performance data to give us more insight into the potential impacts of long-duration missions to Mars on crew health and performance,” said Grace Douglas, CHAPEA principal investigator. “Ultimately, this information will help Nasa make informed decisions to design and plan for a successful human mission to Mars.” The four members of the CHAPEA mission are research scientist Kelly Haston, structural engineer Ross Brockwell, emergency medicine physician Nathan Jones and microbiologist Anca Selariu. Each were chosen after Nasa put out a call for “healthy, motivated” applicants in 2021. There have been several previous research projects involving simulated Mars habitats, with the Mars-500 missions between 2007 and 2011 seeing volunteers spend months locked inside a facility in Mosco, Russia. The HI-SEAS program in Hawaii also saw participants spend time living in isolation, though one mission lasted just four days after one of the crew members suffered an electric shock. Nasa plans to return humans to the Moon within the next three years as part of its Artemis missions, which the US space agency hopes to use as a foundation to eventually send astronauts to Mars. Private space firm SpaceX also plans to send people to Mars aboard its Starship rocket, which is currently under development at the company’s Starbase facility in Texas. SpaceX boss Elon Musk said a second attempt at an orbital flight test will be made before the end of August, after the first attempt in April ended in a large explosion just minutes after take off. The 480 million kilometre (300 million mile) journey to Mars is expected to take around seven months, with the planet’s orbit meaning that a travel window only opens up every 26 months. This means that any return mission would likely take close to four years to complete. Read More Elon Musk to launch biggest ever rocket after dramatic failure Elon Musk eyes ‘highly habitable’ planet that’s ‘practically next door’ Elon Musk eyes ‘highly habitable’ planet that’s ‘practically next door’ Apple releases urgent update to iPhone and iPad users Twitter hacker who took over Musk, Obama, Biden accounts gets prison sentence

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