Dunlap Institute 3 Apr 2017, 08:19 UTC Using a novel method, a team of astronomers has performed the most comprehensive search yet for a radio signal from the cosmic web, the vast network of filaments connecting clusters of galaxies. The search is an important step forward in mapping the large-scale magnetic field of the Universe because any radio signal from the cosmic web would be generated by the interplay between gas in the filaments and the filaments’ magnetic field. “Radio emission from the cosmic web has yet to be detected,” says Tessa Vernstrom. “It is expected to be very faint, spread over large areas, and mixed with emission from other sources such as our Galaxy or other galaxies."
NASA's Goddard Space Flight Center 31 Mar 2017, 20:47 UTC On April 1, 2017, comet 41P will pass closer than it normally does to Earth, giving observers with binoculars or a telescope a special viewing opportunity. Comet hunters in the Northern Hemisphere should look for it near the constellations Draco and Ursa Major, which the Big Dipper is part of. Whether a comet will put on a good show for observers is notoriously difficult to predict, but 41P has a history of outbursts, and put on quite a display in 1973. If the comet experiences similar outbursts this time, there’s a chance it could become bright enough to see with the naked eye. The comet is expected to reach perihelion, or its closest approach to the sun, on April 12.
ALMA NAOJ 31 Mar 2017, 14:01 UTC As part of an ambitious experiment involving telescopes around the world, the Atacama Large Millimeter/submillimeter Array (ALMA) is about to attempt to image something never-before-seen: a black hole. The Event Horizon Telescope (EHT) and its sister project the Global mm-VLBI Array (GMVA) are Earth-sized virtual telescopes, made possible by an international collaboration of radio telescopes including ALMA. The goal is to image, for the very first time, the shadow of the event horizon of the supermassive black hole at the centre of our Milky Way.
NASA's Chandra X-ray Observatory 30 Mar 2017, 18:06 UTC
Hubble Space Telescope News 30 Mar 2017, 14:00 UTC
NASA's Jet Propulsion Laboratory News and Features 29 Mar 2017, 20:59 UTC
Harvard-Smithsonian Center for Astrophysics 29 Mar 2017, 15:03 UTC Every so often the sun emits an explosive burst of charged particles that makes its way to Earth and often wreaks havoc on power grids, aircraft and satellite systems. When clouds of high-speed charged particles come racing off the sun, they can bathe spacecraft, astronauts and planetary surfaces in damaging radiation. Understanding why the sun occasionally emits these high-energy particles can help scientists predict space weather. Knowing when solar energetic particles may hit Earth can help people on the planet take precautions.