TY - GENERIC DO - 10.20944/preprints202311.0134.v1 UR - http://dx.doi.org/10.20944/preprints202311.0134.v1 TI - How Long Can the Spiral Arms of Disc Galaxies Be Optically Observed? T2 - Preprints AU - Pan, Hongjun PY - 2023 DA - 2023/11/02 PB - Preprints