On November 20, 1889, American astronomer Edwin Hubble was born. He is best known for his role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century.
P. Kalberla, J. Kerp, U. Haud, B. Winkel, N. Bekhti, L. Floeer, and D. Lenz. (2016)cite arxiv:1602.07604Comment: 62 pages, 27 figures, ApJ accepted, a high resolution version is available at https://www.astro.uni-bonn.de/hisurvey/AllSky_profiles/filaments.pdf.