Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 56, pages 3 to 6, October 2018.
Original source
Article written by Emilio Alfaro in the Magazine "Información y Actualidad Astronómica" of the Instituto de Astrofísica de Andalucía (IAA-CSIC), number 56, pages 3 to 6, October 2018.