In 2009, astronomers detected a mysterious source of high-energy, chargeless particles, which appeared to originate from the very edge of the solar system. Through fresh analysis, Dr Li Lu and colleagues at the Chinese Academy of Sciences have discovered that this distance may be an illusion, created by an effect relating to the solar wind as viewed by the commonly used parallax method. If correct, the team’s theory suggests that the as-yet enigmatic signal could actually originate from a source just beyond Earth’s atmosphere.

Outdoor swimming pools are enjoyed by millions of us, but it is often challenging to maintain comfortable temperatures across different climates and weather conditions, which can drastically vary the rate of heat transfer away from the water. Through their research, a team led by Prof. Hui Tong Chua from The University of Western Australia has introduced a new empirical model that can accurately predict this transfer of heat, accounting for weather conditions and the surrounding environment. They hope that their model could improve the efficiency of outdoor pool heating systems, helping them to become more sustainable.

Astronomers know that the nearby Centaurus A galaxy contains a supermassive black hole at its centre, but there are several unusual and mind-boggling features in the detailed picture that was recently made of this galaxy’s core, which have yet to be explained. To understand these anomalies, Dr David Anthony Cosandey, an astrophysicist at the Zurich Higher Education Centre, suggests that the galaxy actually contains a pair of supermassive black holes which will eventually merge into a single object. If his theory is confirmed, Centaurus A could not only host the tightest orbiting pair of these immense objects ever discovered; this pair of giant black holes would also be by far the nearest to us that we know of.