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ALMA starts observing the Sun

17 January 2017 Stephen Clark

New images taken with the Atacama Large Millimeter/submillimeter Array in Chile have revealed otherwise invisible details of our Sun, including a new view of the dark, contorted centre of a sunspot that is nearly twice the diameter of the Earth.

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Interacting galaxies produce eye-shaped “tsunami” of stars

5 November 2016 Astronomy Now

Astronomers using the Atacama Large Millimetre/submillimetre Array (ALMA) have discovered a tsunami of stars and gas that is crashing midway through the disc of a spiral galaxy known as IC 2163. This colossal wave of material — which was triggered when IC 2163 recently sideswiped another spiral galaxy dubbed NGC 2207 — produced dazzling arcs of intense star formation that resemble a pair of eyelids.

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Green Bank Observatory: the making of an American astronomy icon

10 October 2016 Astronomy Now

Astronomers have just celebrated the inauguration of the Green Bank Observatory in West Virginia, home to the 100-metre Green Bank Telescope, one of the world’s most powerful astronomical instruments. During its 60-year history, Green Bank has been home to some of the world’s most innovative and productive radio telescopes.

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Protoplanetary disc’s spiral arms embrace young star

1 October 2016 Astronomy Now

Swirling around the young star Elias 2-27 is a stunning spiral-shape pinwheel of dust. This striking feature, seen with the Atacama Large Millimetre/submillimetre Array (ALMA), is the product of density waves — gravitational perturbations in the star’s protoplanetary disc that produce sweeping arms reminiscent of a spiral galaxy, but on a much smaller scale.

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ALMA uncovers insights into “Golden Age” of galaxy formation

22 September 2016 Astronomy Now

International teams of astronomers have used the Atacama Large Millimeter/submillimeter Array (ALMA) to explore the distant corner of the universe first revealed in the iconic images of the Hubble Ultra Deep Field (HUDF). These new ALMA observations are significantly deeper and sharper than previous surveys at millimetre wavelengths.

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‘Frankenstein’ galaxy UGC 1382 surprises astronomers

13 July 2016 Astronomy Now

About 250 million light-years away, there’s a neighbourhood of our universe that astronomers had considered quiet and unremarkable. But now, scientists have uncovered an enormous, bizarre galaxy possibly formed from the parts of other galaxies. Some 718,000 light-years across, UGC 1382 is more than seven times wider than the Milky Way.

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ALMA measures mass of black hole with extreme precision

6 May 2016 Astronomy Now

Using the Atacama Large Millimetre/submillimetre Array (ALMA), a team of astronomers has delved remarkably deep into the heart of a nearby elliptical galaxy to study the motion of a disc of gas encircling the supermassive black hole at its centre. These observations provide one of the most accurate mass measurements to date for a black hole outside of our galaxy.

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Dwarf dark galaxy hidden in ALMA gravitational lens image

14 April 2016 Astronomy Now

Subtle distortions hidden in a stunning Atacama Large Millimetre/submillimetre Array (ALMA) image of the gravitational lens SDP.81 are telltale signs that a dwarf dark galaxy is lurking in the halo of a much larger galaxy nearly 4 billion light-years away. This discovery could help astronomers address important questions on the nature of dark matter.