![Astronomical surveys / National Geographic Society – Palomar Observatory Sky Survey / Palomar Observatory / Schmidt camera / Photographic plate / Project Echo / Balloon satellite / Satellite / Apexart / Observational astronomy / Astronomy / Space Astronomical surveys / National Geographic Society – Palomar Observatory Sky Survey / Palomar Observatory / Schmidt camera / Photographic plate / Project Echo / Balloon satellite / Satellite / Apexart / Observational astronomy / Astronomy / Space](https://www.pdfsearch.io/img/94e23e7f56bb032f732a6a2bccb67ab7.jpg) Date: 2013-07-20 01:31:28Astronomical surveys National Geographic Society – Palomar Observatory Sky Survey Palomar Observatory Schmidt camera Photographic plate Project Echo Balloon satellite Satellite Apexart Observational astronomy Astronomy Space | | gridded into 6-degree sections and photographed in two wavelengths, red and blue, using Palomar’s 48-inch Oschin Schmidt telescope. Rudolf Minkowski, a German refugee astronomer who fled Nazi persecution in the late 19Add to Reading ListSource URL: apexart.orgDownload Document from Source Website File Size: 451,70 KBShare Document on Facebook
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