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Fossil remains of the black hole-eating frenzy of the past have been found deep within one of the largest galaxy clusters in our sky. Astronomers also saw physics-defying plasma shockwaves, and loops of radio energy within the same galaxy cluster. Key points: Astronomers have discovered a trio of rare objects in a distant galaxy cluster known as Abell 3266 One of the mysterious objects is a shockwave relic dubbed the “wrong way”. The objects were discovered using radio telescopes in Western Australia and New South Wales The cluster – Abell 3266 – is located 800 million light-years away and spans the sky 300 million light-years in the southern constellation Reticulum. An international team of astronomers, led by Christopher Riseley of the University of Bologna in Italy, studied the cluster in detail using the powerful Australian Square Kilometer Array Pathfinder radio telescope in outback Western Australia, and the smaller Australia Telescope Compact Array in Narrabri, New South Wales.

The universe is filled with galaxy clusters – massive structures piled up at the intersection of the cosmic web. A single cluster can span millions of light years and consist of hundreds, or even thousands, of galaxies. However, these galaxies represent only a few percent of the total mass of the cluster. About 80% of it is dark matter, and the rest is hot plasma “soup”: gas heated to above 10,000,000℃ and entwined with weak magnetic fields. We and our team of international colleagues have identified a series of rarely observed radio objects – radio remains, radio halos, and radio emission fossils – in a highly dynamic galaxy cluster called Abell 3266. They challenge existing theories about the object’s origin. and their characteristics. Relics, halos and fossils Clusters of galaxies allow us to study a rich variety of processes – including magnetism and plasma physics – in environments that we cannot recreate in our laboratories. When the clusters collide with each other, a large a

the little one The dim, red dot in the center of the newly released image of a distant galaxy indicates the galaxy underwent one of the most powerful explosions since the Big Bang. Astronomer Brendan O’Connor and his colleagues recently discovered this as-yet-unnamed galaxy 9 billion light-years away in data from the Gemini North Telescope in Hawai’i, and they say it is the source of a brilliant, bright beam of gamma radiation. brief dazzling NASA. Swift Observatory in late 2015. Imagine an explosion releasing as much energy as our Sun would in 10 billion years – compressed into an explosion in less than two seconds. Astronomers call this almost unimaginable catastrophe a short gamma-ray burst, and the universe hasn’t seen a brighter or more powerful explosion since the Big Bang. What could cause such an event? The answer appears to involve two colliding neutron stars. Binary star systems are not very rare in the universe; one of our closest neighbors, Alpha Centauri, is actually