Free Astronomy Magazine March-April 2023

Editor in chief Michele Ferrara Scientific advisor Prof. Enrico Maria Corsini Publisher Astro Publishing di Pirlo L. Via Bonomelli, 106 25049 Iseo - BS - ITALY email Internet Service Provider Aruba S.p.A. Via San Clemente, 53 24036 Ponte San Pietro - BG - ITALY Copyright All material in this magazine is, unless otherwise stated, property of Astro Publishing di Pirlo L. or included with permission of its author. Reproduction or retransmission of the materials, in whole or in part, in any manner, with- out the prior written consent of the copyright holder, is a violation of copy- right law. A single copy of the materi- als available through this course may be made, solely for personal, noncom- mercial use. Users may not distribute such copies to others, whether or not in electronic form, whether or not for a charge or other consideration, with- out prior written consent of the copy- right holder of the materials. The publisher makes available itself with having rights for possible not charac- terized iconographic sources. Advertising - Administration Astro Publishing di Pirlo L. Via Bonomelli, 106 25049 Iseo - BS - ITALY email ASTROFILO l’ March-April 2023 BI-MONTHLY MAGAZINE OF SCIENTIFIC AND TECHNICAL INFORMATION FREELY AVAILABLE THROUGH THE INTERNET English edition of the magazine Stars are disappearing faster and faster Hydrogen masers reveal new secrets of a massive star The majesty of our Milky Way in unprecedented detail Black hole devours bypassing star A near-pristine star found to be binary A galactic shock is shaping Stephan’s Quintet Two waterworlds in the Kepler-138 system The Fermi paradox − many solutions, no certainty Webb confirms its first exoplanet Mysterious “ghost” stars wandering around for billions of years Pair of black holes dine together in nearby galaxy merger 4 14 18 22 24 26 30 34 42 46 48