The phrase "longest baseline" refers to the longest distance or measurement between two points, usually used in the context of scientific or technological observations or measurements. Full definition
Related sites Very Long Baseline Array of radio telescopes, used in the study Another image of Arp 299 with more background Tutorial on starburst galaxies (sciencemag.org)
They mapped out how far star - forming regions were from the sky, using the National Radio Astronomy Observatory's Very Long Baseline Array of telescopes, and calculating how far these war form Earth. (businessinsider.com)
Today, researchers at the Joint Institute for Very Long Baseline Interferometry in Dwingeloo, the Netherlands, dedicated the $ 10 million European VLBI Network Data Processor, which will knit together data from 16 telescopes across Europe. (sciencemag.org)