Radio astronomers discover 8 new millisecond pulsars
A group of astronomers has discovered 8 millisecond pulsars located within the dense clusters of stars, known as “globular clusters , using South Africa’s MeerKAT radio telescope.
Millisecond pulsars are neutron stars, the most compact star known, that spin up to 700 times per second. This is the first pulsar discovery using the MeerKAT antennas and it comes from the synergic work of two international collaborations, TRAPUM and MeerTIME, with the findings detailed in a
Millisecond pulsars are extremely compact stars mainly made up of neutrons, and are amongst the most extreme objects in the universe: they pack hundreds of thousands of times the mass of the Earth in a sphere with a diameter of about 24 km; and spin at a rate of hundreds of rotations per second. They emit a beam of radio waves that are detected by the observer at every rotation, like a lighthouse. The formation of these objects is highly enhanced in the star
The Great Debate of 1920: how it changed astronomy
April 28, 2021 at 10:10 am
In 1920, astronomers Harlow Shapley and Heber Curtis came together to take part in the Great Debate about the scale of the Universe. But what ultimately, was astronomy’s Great Debate about, and how did it change the way we look at the Universe?
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Harlow Shapley, a 34-year-old journalist-turned-astronomer, must have been nervous when he climbed the stage in the Baird Auditorium of the Smithsonian Museum of Natural History in Washington, DC on 26 April 1920. Facing him was a crowd of fellow scientists and lay people alike.
On stage after Shapley would be his opponent in the Great Debate, eminent astronomer Heber Curtis – a man 13 years his senior, more experienced and eloquent at speaking, and who disagreed with Shapley on just about everything.
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Center for Astrophysics
EHT Collaboration
Cambridge, MA – In April 2019, scientists released the first image of a black hole in galaxy M87 using the Event Horizon Telescope (EHT). However, that remarkable achievement was just the beginning of the science story to be told.
Data from 19 observatories released today promise to give unparalleled insight into this black hole and the system it powers, and to improve tests of Einstein’s General Theory of Relativity.
“We knew that the first direct image of a black hole would be groundbreaking,” says Kazuhiro Hada of the National Astronomical Observatory of Japan, a co-author of a new study published in The Astrophysical Journal Letters that describes the large set of data. “But to get the most out of this remarkable image, we need to know everything we can about the black hole’s behavior at that time by observing over the entire electromagnetic spectrum.”
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