Stars

Artistic concept of an aurora at the north pole of a brown dwarf (Image Chuck Carter and Gregg Hallinan/Caltech)

Its aurora is 10,000 times more powerful than any other ever seen, somuch as to be detectable, although with very sophisticated instruments, from a distance of 18 light years. It was found on a brown dwarf called LSR J1835+3259 using the Karl G. Jansky Very Large Array (VLA), the Hale Telescope in California and the Keck Telescope in Hawaii. The results of this research have just been published in the journal “Nature”.

A comparison of the Kepler-452 system with the solar system and the Kepler-186 system (Image NASA/JPL-CalTech/R. Hurt)

NASA announced the discovery of the planet Kepler-452b made using the Kepler space telescope. It has an orbit similar to that of the Earth around a star similar to the Sun. This puts it well within the habitable zone of its star system because the star Kepler-452 is just a little bigger and brighter than the Sun so if on the planet Kepler-452b there was an atmosphere similar to the Earth’s, water could exist in liquid form.

Picture of the Sun taken by the STEREO-A space probe (Photo NASA/STEREO)

NASA’s STEREO-A (Solar TErrestrial Relations Observatory Ahead) space probe has resumed contact with the Earth a few days ago after more than three months and on July 15 sent new photographs of the other side of the Sun from the Earth. Its EUVI (Extreme UltraViolet Imager) instrument was used to take photographs at a wavelength of 171 angstroms, invisible the human eye, then colorized in blue to allow us to appreciate them.

This artist’s impression shows a supernova and associated gamma-ray burst driven by a magnetar (Image ESO)

An article published in “Nature” describes the research conducted by an international team led by Jochen Greiner of the Max-Planck-Institut für extraterrestrische Physik, Garching, Germany who studied a gamma-ray burst (GRB) detected on December 9, 2011 by NASA’s Swift satellite and called GRB 111209A. It was an exceptional phenomenon because it lasted more than three hours when gamma-ray bursts typically last from a few seconds to a few minutes. It was the first case of GRB associated with a supernova, called SN 2011kl, which produced a magnetar, a neutron star with an incredibly strong magnetic field.

Artistic impression of the galaxy CR7 (Image ESO/M. Kornmesser)

An article accepted for publication in “The Astrophysical Journal” describes the discovery of a galaxy called CR7 seen as it was at the time of the early universe in which first-generation stars were found. This research was carried out mainly using ESO’s Very Large Telescope but data collected by the W. M. Keck Observatory, the Subaru Telescope and the Hubble Space Telescope were also used.