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Its relic outer lobes are separated by about 3\u2032 in the sky, corresponding to \u223c1 Mpc projected linear size. Inside this large-scale structure, the inner pair of collinear lobes span about 100 kpc. In the arcsec-resolution radio images of J0028+0035, there is a central radio feature that offers the intriguing possibility of being resolved into a pc-scale, third pair of innermost lobes. This would make this radio galaxy a rare triple\u2013double source where traces of three distinct episodes of radio activity could be observed. To reveal the compact radio structure of the central component, we conducted observation with the European Very Long Baseline Interferometer Network and the enhanced Multi Element Remotely Linked Interferometer Network. Our 1.66 GHz image with high (\u223c5 milliarcsec) resolution shows a compact central radio core with no indication of a third, innermost double feature. The observation performed in multi-phase-centre mode also revealed that the physically unrelated but in projection closely separated background source 5BZU J0028+0035 has a single weak, somewhat resolved radio feature, at odds with its blazar classification.<\/jats:p>","DOI":"10.3390\/sym17020171","type":"journal-article","created":{"date-parts":[[2025,1,23]],"date-time":"2025-01-23T09:01:13Z","timestamp":1737622873000},"page":"171","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["What Is Inside the Double\u2013Double Structure of the Radio Galaxy J0028+0035?"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3079-1889","authenticated-orcid":false,"given":"S\u00e1ndor","family":"Frey","sequence":"first","affiliation":[{"name":"Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly Thege Mikl\u00f3s \u00fat 15-17, 1121 Budapest, Hungary"},{"name":"CSFK, MTA Centre of Excellence, Konkoly Thege Mikl\u00f3s \u00fat 15-17, 1121 Budapest, Hungary"},{"name":"Institute of Physics and Astronomy, ELTE E\u00f6tv\u00f6s Lor\u00e1nd University, P\u00e1zm\u00e1ny P\u00e9ter s\u00e9t\u00e1ny 1\/A, 1117 Budapest, Hungary"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7363-298X","authenticated-orcid":false,"given":"Andrzej","family":"Marecki","sequence":"additional","affiliation":[{"name":"Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudzi\u0105dzka 5, 87-100 Toru\u0144, Poland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1020-1597","authenticated-orcid":false,"given":"Krisztina \u00c9va","family":"Gab\u00e1nyi","sequence":"additional","affiliation":[{"name":"Konkoly Observatory, HUN-REN Research Centre for Astronomy and Earth Sciences, Konkoly Thege Mikl\u00f3s \u00fat 15-17, 1121 Budapest, Hungary"},{"name":"CSFK, MTA Centre of Excellence, Konkoly Thege Mikl\u00f3s \u00fat 15-17, 1121 Budapest, Hungary"},{"name":"Department of Astronomy, Institute of Physics and Astronomy, ELTE E\u00f6tv\u00f6s Lor\u00e1nd University, P\u00e1zm\u00e1ny P\u00e9ter s\u00e9t\u00e1ny 1\/A, 1117 Budapest, Hungary"},{"name":"HUN-REN\u2014ELTE Extragalactic Astrophysics Research Group, ELTE E\u00f6tv\u00f6s Lor\u00e1nd University, P\u00e1zm\u00e1ny P\u00e9ter s\u00e9t\u00e1ny 1\/A, 1117 Budapest, Hungary"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0870-7778","authenticated-orcid":false,"given":"Marek","family":"Jamrozy","sequence":"additional","affiliation":[{"name":"Astronomical Observatory, Jagiellonian University, Orla 171, 30-244 Krak\u00f3w, Poland"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2","DOI":"10.1007\/s00159-017-0102-9","article-title":"Active galactic nuclei: What is in a name?","volume":"25","author":"Padovani","year":"2017","journal-title":"Astron. 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