Every Year NASA Simulates Our View of the Moon for the Upcoming 12 Months. Here’s 2021, Hour by Hour There’s no real reason most of us need to know what the Moon will look like on any particular day at any particular hour next year. No reason other than intellectual curiosity, that is. So if […]
Geysers on Europa might come from pockets of water under the ice Observations have already confirmed the existence of a sub-surface ocean on Europa, and there has been rampant speculation about whether they could contain life. While there have been tentative plans to send a submersible spacecraft to this ocean, we are still a long […]
Linking globular cluster structural parameters and their evolution: multiple stellar populations. (arXiv:2011.12292v1 [astro-ph.GA]) <a href="http://arxiv.org/find/astro-ph/1/au:+Mastrobuono_Battisti_A/0/1/0/all/0/1">Alessandra Mastrobuono-Battisti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Perets_H/0/1/0/all/0/1">Hagai B. Perets</a> Globular clusters (GCs) are known to host multiple stellar populations showing chemical anomalies in the content of elements lighter than Si. The origin of such anomalies and of the internal metallicity spreads observed in Galactic […]
No Stagnation Region Before the Heliopause at Voyager 1? Inferences From New Voyager 2 Results. (arXiv:2011.12926v1 [astro-ph.HE]) <a href="http://arxiv.org/find/astro-ph/1/au:+Cummings_A/0/1/0/all/0/1">A. C. Cummings</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Stone_E/0/1/0/all/0/1">E. C. Stone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Richardson_J/0/1/0/all/0/1">J. D. Richardson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Heikkila_B/0/1/0/all/0/1">B. C. Heikkila</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lal_N/0/1/0/all/0/1">N. Lal</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kota_J/0/1/0/all/0/1">J. Kóta</a> We present anisotropy results for anomalous cosmic-ray (ACR) protons in the energy range $sim$0.5-35 MeV from […]
The accretion rates and mechanisms of Herbig Ae/Be stars. (arXiv:2001.05971v2 [astro-ph.SR] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Wichittanakom_C/0/1/0/all/0/1">C. Wichittanakom</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oudmaijer_R/0/1/0/all/0/1">R. D. Oudmaijer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fairlamb_J/0/1/0/all/0/1">J. R. Fairlamb</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mendigutia_I/0/1/0/all/0/1">I. Mendigutía</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vioque_M/0/1/0/all/0/1">M. Vioque</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ababakr_K/0/1/0/all/0/1">K. M. Ababakr</a> This work presents a spectroscopic study of 163 Herbig Ae/Be stars. Amongst these, we present new data for 30 objects. Stellar parameters […]
Euclid preparation: VII. Forecast validation for Euclid cosmological probes. (arXiv:1910.09273v2 [astro-ph.CO] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Collaboration_Euclid/0/1/0/all/0/1">Euclid Collaboration</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Blanchard_A/0/1/0/all/0/1">A. Blanchard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Camera_S/0/1/0/all/0/1">S. Camera</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Carbone_C/0/1/0/all/0/1">C. Carbone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cardone_V/0/1/0/all/0/1">V.F. Cardone</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Casas_S/0/1/0/all/0/1">S. Casas</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clesse_S/0/1/0/all/0/1">S. Clesse</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ilic_S/0/1/0/all/0/1">S. Ilić</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kilbinger_M/0/1/0/all/0/1">M. Kilbinger</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kitching_T/0/1/0/all/0/1">T. Kitching</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kunz_M/0/1/0/all/0/1">M. Kunz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lacasa_F/0/1/0/all/0/1">F. Lacasa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Linder_E/0/1/0/all/0/1">E. Linder</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Majerotto_E/0/1/0/all/0/1">E. Majerotto</a>, <a […]
A study of dynamical effects in the observed second time-derivative of the spin or orbital frequencies of pulsars. (arXiv:1909.13113v4 [astro-ph.HE] UPDATED) <a href="http://arxiv.org/find/astro-ph/1/au:+Pathak_D/0/1/0/all/0/1">Dhruv Pathak</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bagchi_M/0/1/0/all/0/1">Manjari Bagchi</a> The observed values of the time-derivatives of the spin or orbital frequency of pulsars are affected by their dynamical properties. We derive thorough analytical expressions for such dynamical […]
Classically stable non-singular cosmological bounces. (arXiv:1606.08880v3 [gr-qc] UPDATED) <a href="http://arxiv.org/find/gr-qc/1/au:+Ijjas_A/0/1/0/all/0/1">Anna Ijjas</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Steinhardt_P/0/1/0/all/0/1">Paul J. Steinhardt</a> One of the fundamental questions of theoretical cosmology is whether the universe can undergo a non-singular bounce, i.e., smoothly transit from a period of contraction to a period of expansion through violation of the null energy condition (NEC) at energies […]
The Moon has Resources, but Not Enough to Go Around A new study led by the Harvard-Smithsonian Center for Astrophysics explains how the Moon may not have enough resources to support everything we plan to build up there. The post The Moon has Resources, but Not Enough to Go Around appeared first on Universe Today. […]
Astronomers See a Newly Forming Planetary Disk That’s Continuing to Feed On Material from its Nebula Over the last few years, astronomers have observed distant solar systems in their early stages of growth. ALMA (Atacama Large Millimeter/submillimeter Array) has captured images of young stars and their disks of material. And in those disks, they’ve spotted […]
New Hubble data explains missing dark matter New data from the NASA/ESA Hubble Space Telescope provides further evidence for tidal disruption in the galaxy NGC 1052-DF4. This result explains a previous finding that this galaxy is missing most of its dark matter. By studying the galaxy’s light and globular cluster distribution, astronomers have concluded that […]
Rapid-forming giants could disrupt spiral protoplanetary discs Giant planets that developed early in a star system’s life could solve a mystery of why spiral structures are not observed in young protoplanetary discs, according to a new study by University of Warwick astronomers. phys.org Go to Source
Weekly Space Hangout: November 25, 2020, Dr. Olivier Witasse, Project Scientist, the JUICE Mission This week we are aired Fraser’s pre-recorded interview with Dr. Olivier Witasse, Project Scientist on the JUICE mission. Olivier studied fundamental physics and astrophysics at the universities of Paris XI (Orsay) and Lyon between 1990 and 1996. He obtained a PhD […]
Prospects for Observing and Localizing Gravitational-Wave Transients with Advanced LIGO, Advanced Virgo and KAGRA. (arXiv:1304.0670v11 [gr-qc] UPDATED) The <a href="http://arxiv.org/find/gr-qc/1/au:+Collaboration_LIGO_Scientific/0/1/0/all/0/1">LIGO Scientific Collaboration</a>, the <a href="http://arxiv.org/find/gr-qc/1/au:+Collaboration_Virgo/0/1/0/all/0/1">Virgo Collaboration</a>, the <a href="http://arxiv.org/find/gr-qc/1/au:+Collaboration_KAGRA/0/1/0/all/0/1">KAGRA Collaboration</a>: <a href="http://arxiv.org/find/gr-qc/1/au:+Abbott_B/0/1/0/all/0/1">B. P. Abbott</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Abbott_R/0/1/0/all/0/1">R. Abbott</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Abbott_T/0/1/0/all/0/1">T. D. Abbott</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Abraham_S/0/1/0/all/0/1">S. Abraham</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Acernese_F/0/1/0/all/0/1">F. Acernese</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Ackley_K/0/1/0/all/0/1">K. Ackley</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Adams_C/0/1/0/all/0/1">C. Adams</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Adya_V/0/1/0/all/0/1">V. […]
Simulations of neutrino and gamma-ray production from relativistic black-hole microquasar jets. (arXiv:2011.12939v1 [hep-ph]) <a href="http://arxiv.org/find/hep-ph/1/au:+Papavasileiou_T/0/1/0/all/0/1">Th. V. Papavasileiou</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Kosmas_O/0/1/0/all/0/1">O. T. Kosmas</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Sinatkas_J/0/1/0/all/0/1">J. Sinatkas</a> Recently, microquasar jets have aroused the interest of many researchers focusing on the astrophysical plasma outflows and various jet ejections. In this work, we concentrate on the investigation of electromagnetic radiation […]
Observing relativistic features in large-scale structure surveys — II: Doppler magnification in an ensemble of relativistic simulations. (arXiv:2011.12936v1 [astro-ph.CO]) <a href="http://arxiv.org/find/astro-ph/1/au:+Coates_L/0/1/0/all/0/1">Louis Coates</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Adamek_J/0/1/0/all/0/1">Julian Adamek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bull_P/0/1/0/all/0/1">Philip Bull</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Guandalin_C/0/1/0/all/0/1">Caroline Guandalin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Clarkson_C/0/1/0/all/0/1">Chris Clarkson</a> The standard cosmological model is inherently relativistic, and yet a wide range of cosmological observations can be predicted accurately from essentially […]
Early modified gravity in light of the $H_0$ tension and LSS data. (arXiv:2011.12934v1 [astro-ph.CO]) <a href="http://arxiv.org/find/astro-ph/1/au:+Braglia_M/0/1/0/all/0/1">Matteo Braglia</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ballardini_M/0/1/0/all/0/1">Mario Ballardini</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Finelli_F/0/1/0/all/0/1">Fabio Finelli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koyama_K/0/1/0/all/0/1">Kazuya Koyama</a> We present a model of Early Modified Gravity (EMG) consisting in a scalar field $sigma$ with a non-minimal coupling to the Ricci curvature of the type $M^2_{rm pl}+xi sigma^2$ […]
Restitution of the K and F Components of the Solar Corona from LASCO-C2 Images over 24 Years [1996–2019]. (arXiv:2011.12920v1 [astro-ph.SR]) <a href="http://arxiv.org/find/astro-ph/1/au:+Llebaria_A/0/1/0/all/0/1">Antoine Llebaria</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Lamy_P/0/1/0/all/0/1">Philippe Lamy</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Gilardy_H/0/1/0/all/0/1">Hugo Gilardy</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Boclet_B/0/1/0/all/0/1">Brice Boclet</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Loirat_J/0/1/0/all/0/1">Jean Loirat</a> (1) ((1) Laboratoire d'Astrophysique de Marseille, (2) Laboratoire Atmospheres, Milieux et Observations Spatiales) We present a […]
String-inspired Teleparallel Cosmology. (arXiv:2003.13434v3 [gr-qc] UPDATED) <a href="http://arxiv.org/find/gr-qc/1/au:+Bahamonde_S/0/1/0/all/0/1">Sebastian Bahamonde</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Marciu_M/0/1/0/all/0/1">Mihai Marciu</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Odintsov_S/0/1/0/all/0/1">Sergei D. Odintsov</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Rudra_P/0/1/0/all/0/1">Prabir Rudra</a> The present paper represents an attempt for a very generic string inspired theory of gravitation, based on a stringy action in the teleparallel gravity which includes a specific functional which depends on the scalar field and […]
XAO-assisted coronagraphy with SHARK NIR: from simulations to laboratory tests. (arXiv:2011.12899v1 [astro-ph.IM]) <a href="http://arxiv.org/find/astro-ph/1/au:+Umbriaco_G/0/1/0/all/0/1">Gabriele Umbriaco</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Carolo_E/0/1/0/all/0/1">Elena Carolo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Vassallo_D/0/1/0/all/0/1">Daniele Vassallo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Farinato_J/0/1/0/all/0/1">Jacopo Farinato</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Baudoz_P/0/1/0/all/0/1">Pierre Baudoz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Carlotti_A/0/1/0/all/0/1">Alexis Carlotti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Greggio_D/0/1/0/all/0/1">Davide Greggio</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marafatto_L/0/1/0/all/0/1">Luca Marafatto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bergomi_M/0/1/0/all/0/1">Maria Bergomi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Viotto_V/0/1/0/all/0/1">Valentina Viotto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Agapito_G/0/1/0/all/0/1">Guido Agapito</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Biondi_F/0/1/0/all/0/1">Federico Biondi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Chinellato_S/0/1/0/all/0/1">Simonetta Chinellato</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pascale_M/0/1/0/all/0/1">Marco De Pascale</a>, […]
