Above: On ancient Mars, water carved channels and transported sediments to form fans and deltas within lake basins. Examination of spectral data acquired from orbit show that some of these sediments have minerals that indicate chemical alteration by water. Here in the Jezero Crater delta, sediments contain clays and carbonates. Credit: NASA/JPL-Caltech/MSSS/JHU-APL
The most recent issue of Free Astronomy Magazine (January-February 2020) is available for your reading and downloading pleasure at www.astropublishing.com (click the link to go directly to the issue).
Feature articles this month include (1) a great read on the history of the discovery of the (dwarf) planet Pluto, (2) SOFIA confirming the collision of two planets in an old star system, and (3) details about the landing site selection of Jezero Crater for Mars 2020 (with an image from the article featured about and downloadable from www.jpl.nasa.gov…PIA23239).
For those wanting a quick look at what the issue has to offer, the Table of Contents is reproduced below.
The web browser-readable version: www.astropublishing.com/1FAM2020/
Jump right to the PDF download (14 MB): January-February 2020