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“#Rare-metal abundance points to a missing companion star for the supernova Cassiopeia A” Figure 1: The Cassiopeia A supernova remnant as observed by NASA’s Chandra X-ray Observatory. Calculations by RIKEN based on Chandra data indicate that the progenitor star had a companion, which has yet to be observed. Credit: NASA/ CXC/ SAO The massive star…
“#Image: Hubble captures one galaxy, two asteroids” Credit: ESA/Hubble & NASA; J. Cannon (Macalester College) At first sight, this image from the NASA/ESA Hubble Space Telescope portrays the sparkling stars of AGC111977, a dwarf galaxy located around 15 million light years away and visible in the lower left part of the image. Other galaxies appear…
“#Scientists detect rapid changes in a black hole that may explain gamma-ray bursts” Credit: CC0 Public Domain Some of the most massive and distant black holes in the universe emit an enormous amount of extraordinarily energetic radiation called gamma rays. This type of radiation occurs, for example, when mass is converted into energy during fission…
“#Unprecedented ground-based discovery of two strongly interacting exoplanets” Artistic view of the strongly interacting exoplanetary system WASP-148. The planet WASP-148c is shown in front. On the back, one can see the planet WASP-148b transiting the host star around which the two planets are in orbit. Credit: Institut d’astrophysique de Paris, Mark A. Garlick Several interacting…
“#Stellar fireworks celebrate birth of giant cluster” Star cluster G286.21 0.17, caught in the act of formation. This is a multiwavelength mosaic of more than 750 ALMA radio images, and 9 Hubble infrared images. ALMA shows molecular clouds (purple) and Hubble shows stars and glowing dust (yellow and red). Credit: ALMA (ESO/NAOJ/NRAO), Y. Cheng et…
“#Gaia revolutionises asteroid tracking” Gaia mapping the stars of the Milky Way. Credit: ESA/ATG medialab; background: ESO/S. Brunier ESA’s Gaia space observatory is an ambitious mission to construct a three-dimensional map of our galaxy by making high-precision measurements of over one billion stars. However, on its journey to map distant suns, Gaia is revolutionising a…
“#Researchers find the origin and the maximum mass of massive black holes” Schematic diagram of the binary black hole formation path for GW170729. A star below 80 solar masses evolves and develops into a core-collapse supernova. The star does not experience pair-instability, so there is no significant mass ejection by pulsation. After the star forms…
“#First exposed planetary core discovered allows glimpse inside other worlds” Artist’s impression showing a Neptune-sized planet in the Neptunian Desert. It is extremely rare to find an object of this size and density so close to its star. Credit: University of Warwick/Mark Garlick The surviving core of a gas giant has been diskovered orbiting a…
“#A binary star as a cosmic particle accelerator” Using the High Energy Sterescopic System H.E.S.S., astrophysicists have identified colliding stellar winds from the double star Eta Carinae as a new type of source of very high-energy (VHE) cosmic gamma radiation. Credit: DESY, Science Communication Lab With a specialized telescope in Namibia a DESY-led team of…
“#Astronomers see unexpected molecule in exoplanet atmosphere” Artist’s impression of a Jupiter-sized exoplanet. Credit: ESO/L.Calçada SRON-astronomers have found the signature for aluminum oxide (AlO) in the spectrum of exoplanet WASP-43b. This came as a surprise because AlO is expected to stay hidden in the lower atmospheric layers. It is only the second time that astronomers…