![]() ![]() The results were published in Astronomy & Astrophysics.Ī version of this article was first published in February 2021. "After many years of software development, it is so wonderful to see that this has now really worked out," said astronomer Huub Röttgering of Leiden Observatory in the Netherlands. This is what has given us such a clear view of the ultra-low-frequency sky. Over the 256 hours that LOFAR stared at the sky, that's a lot of corrections. ![]() To overcome this problem, the team used supercomputers running algorithms to correct for ionospheric interference every four seconds. A black hole is a dense, compact object whose gravitational pull is so strong that within a certain distance of it nothing can escape, not even light. The frequencies that do penetrate the ionosphere can vary according to atmospheric conditions. Browse 11,416 black hole stock photos and images available, or search for black hole space or black hole in space to find more great stock photos and pictures. At frequencies below 5 megahertz, the ionosphere is opaque for this reason. This is particularly problematic for ultra-low-frequency radio waves, which can be reflected back into space. Scientists have obtained the first image of a black hole, using Event Horizon Telescope observations of the center of the galaxy M87. Because it's based on Earth, LOFAR does have a significant hurdle to overcome that doesn't afflict space-based telescopes: the ionosphere. ![]()
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