April 26, 2019 Volume 25, Number 17 |
General Interest |
Theme: Children's Book Week |
Tech Tools |
Revisited |
In the News |
General InterestBack to Top | |
Theme: Children's Book WeekBack to Top | |
Tech ToolsBack to Top | |
RevisitedBack to Top | |
In the NewsBack to Top | |
Image of a Black Hole Captured for the First Time | |
Darkness Visible, Finally: Astronomers Capture First Ever Image of a Black Hole The first picture of a black hole opens a new era of astrophysics Black hole picture captured for first time in space breakthrough How Does the Event Horizon Telescope Work? NOVA: Black Hole Apocalypse Event Horizon Telescope On April 10, 2019, astronomers unveiled something that had been anticipated for months: the world's first image of a black hole, a phenomenon whose gravitational force is so great that, past a point of no return known as the event horizon, neither matter nor light can escape its inexorable pull. Black holes have fascinated both scientists and the public for decades, ever since they were first theorized by Albert Einstein in his general theory of relativity. This particular black hole is a supermassive one located approximately 55 million light-years away from Earth in the large galaxy Messier 87. Capturing its image required a radio telescope roughly the size of our entire planet, which scientists made by creating a networked array of eight radio telescopes positioned on four continents (including one in Antarctica) in a project called the Event Horizon Telescope. The enormous amount of observation data gathered by these eight telescopes was shipped on half a ton of hard drives to MIT, where researchers compiled it into a single image using a technique called interferometry. Although Einstein himself was doubtful that something so strange as a black hole could actually be real, the image captured by the Event Horizon Telescope is but one more piece of evidence among the many that scientists have collected over the past century in strong support of black holes' existence. [JDC] The first three links lead to excellent overviews of this extraordinary event and its scientific significance. The first, written by Dennis Overbye for The New York Times, is accompanied by several high-quality images, and the second, written by Lisa Grossman and Emily Conover for Science News, includes a six-minute video. The third link, written by Hannah Devlin for The Guardian, features a helpful graphic visualizing the elements of a black hole and explaining what the Event Horizon Telescope's image depicts. Readers who would like a more thorough explanation will find one at the fourth link, where Camille M. Carlisle explains "very long baseline interferometry" (the specific technique used by the Event Horizon Telescope) in her piece for Sky & Telescope. At the fifth link, readers can watch NOVA's two-hour documentary on black holes, which premiered in January 2018 and is hosted by black hole astrophysicist Janna Levin. Finally, readers may want to check out the Event Horizon Telescope website at the last link, where they can find more details about the project and its upcoming plans, as well as infographics, an FAQ page, a bibliography of published research, and other resources. |