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“#Gamma-ray telescopes measure diameters of distant stars” Adding more telescopes at greater distances can improve the angular resolution of Stellar Intensity Interferometry up to the capability to image stellar surfaces (artist’s concept). Credit: CfA, M. Weiss By reviving a technique capable of combining specialized gamma-ray telescopes to one giant virtual instrument, scientists have measured the…
“#Hundreds of candidate galaxies identified in the protocluster D1UD01” Sky distributions of galaxies in D1UD01 with photometric redshifts between 2.9 and 3.3. Credit: Shi et al., 2020. Astronomers have conducted a detailed multiwavelength study of a distant protocluster of galaxies known as D1UD01. As a result, over 350 candidate galaxies have been detected in this…
“#Could mini-Neptunes be irradiated ocean planets?” Credit: CC0 Public Domain Many exoplanets known today are ‘super-Earths,’ with a radius 1.3 times that of Earth, and ‘mini-Neptunes,’ with 2.4 Earth radii. Mini-Neptunes, which are less dense, were long thought to be gas planets, made up of hydrogen and helium. Now, scientists at the Laboratoire d’Astrophysique de…
“#Continuous gravitational waves in X-ray star systems—the search continues” Artist’s impression of the exotic binary star system AR Scorpii. Credit: M. Garlick/University of Warwick/ESO Gravitational waves are ripples in space-time that come in many forms. So far, short-duration gravitational wave signals have been observed from colliding black holes and colliding neutron stars, but scientists expect…
“#Global hunt to detect collisions in space” Credit: CC0 Public Domain The results of a long-term observation campaign to detect the collision of compact objects in the universe has been announced by a global collaboration including The University of Western Australia. The collaboration allowed researchers to perform a targeted search for the sources of gravitational…
“#Astrophysicists fill in 11 billion years of the universe’s expansion history” The SDSS map is shown as a rainbow of colors, located within the observable Universe (the outer sphere, showing fluctuations in the Cosmic Microwave Background). We are located at the center of this map. The inset for each color-coded section of the map includes…
“#Astronomers discover the most X-ray luminous high-redshift quasar” Quasar CFHQS J142952 544717 as seen by SRG/eROSITA on Dec. 10–11, 2019. Credit: Medvedev et al., 2020. Using the Spektr-RG (SRG) spacecraft, Russian astronomers have investigated a sample of distant quasi-stellar objects (QSOs), or quasars. They report the detection of strong X-ray emissions from such source designated…
“#Image: Hubble spies sparkling galaxy” Credit: ESA/Hubble & NASA, T. Armandroff As beautiful as the surrounding space may be, the sparkling galaxy in the foreground of this image from the NASA/ESA Hubble Space Telescope undeniably steals the show. This spotlight-hogging galaxy, seen set against a backdrop of more distant galaxies of all shapes and sizes,…
“#Separating gamma-ray bursts” The figure indicates how similar different GRBs are to each other. Points which are closer together are more similar, and points which are further away are more different. What we find is that there are two distinct groups, one orange and the other blue. The orange dots appear to correspond to “short”…
“#Do the TRAPPIST-1 planets have atmospheres?” Artist’s impression shows several of the planets orbiting the ultra-cool red dwarf star TRAPPIST-1. Credit: ESO/M. Kornmesser In February of 2017, the scientific community rejoiced as NASA announced that a nearby star (TRAPPIST-1) had a system of no less than seven rocky planets. Since that time, astronomers have conducted…