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On our site, you will also find an online planetarium with the star catalog Hipparcos up to magnitude 8, as well as the deep sky brightest objects of Messier and Bennet catalog.

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Are you an artist with an interest in Earth observation and the climate? Then here’s your chance: enter the Climate from Space competition before 31 December

A small hole in spacecraft Soyuz MS-09 has sparked an investigation into its origin. Cosmonauts spent hours on a spacewalk to gather samples in hopes of determining its cause.

Vol. 620
In section 1. Letters to the Editor Direct evidence of a full dipole flip during the magnetic cycle of a sun-like star by S. Boro Saikia, T. Lueftinger, S. V. Jeffers, C. P. Folsom, V. See, P. Petit, S. C. Marsden, A. A. Vidotto, J. Morin, A. Reiners, M. Guedel, and the BCool collaboration A&A 620, L11


Using spectropolarimetric observations, the authors have investigated the temporal evolution of the dipolar field of a sun-like star, the K dwarf 61 Cyg A. They have provided unprecedented sampling of the field over a single magnetic cycle of a star other than the Sun, and found that the behavior of the field during the cycle resembles the solar magnetic cycle. They show that 61 Cyg A has a dominant dipolar geometry except at chromospheric activity maximum. The dipole axis migrates from the southern to the northern hemisphere during the cycle. It is located at higher latitudes at chromospheric activity cycle minimum and mid-latitudes during cycle maximum. The dipole is the strongest at activity cycle minimum and much weaker at activity cycle maximum.

NASA's InSight lander isn't camera-shy. The spacecraft used a camera on its robotic arm to take its first selfie -- a mosaic made up of 11 images....

The origin of the reservoirs of water on Earth is debated. The Earth's crust may contain at least three times more water than the oceans. This crust water is found in the form of phyllosilicates, whose origin probably differs from...