Results 101 to 110 of about 586,778 (202)

Down But Not Out: The Case of Long-period Comet C/2021 O3 (Panstarrs)

The Astronomical Journal
We combine ground- and space-based observations of long-period comet C/2021 O3 (Panstarrs; perihelion distance 0.287 au) in order to investigate its reported near-perihelion destruction.
David Jewitt, Jing Li, Michael Jaeger, Yoonyoung Kim   +3 more
doaj   +1 more source

GANBISS: a new GPU accelerated N-body code for binary star systems. [PDF]

Celest Mech Dyn Astron, 2023
Zimmermann M, Pilat-Lohinger E.
europepmc   +1 more source

The Formation of the Oort Cloud

In this review, the formation of the Oort Cloud is illuminated from several aspects. One is the history of the subject with an outline of the fundamental discoveries by Öpik [1], Oort [2] and Hills [3]. It is argued that the basic reason for judging Oort as the real discoverer is that he had access to observational data in the form of original orbits ...
openaire   +1 more source

Simulation of cometary orbits in the Oort cloud and in the proximity of planets

, 2014
To examine the influence of different surroundings on cometary orbits we used computer simulations. They showed that there are at least two different sources for the comets that make up the Oort cloud.
Rizk, Charbel, Strömbeck, Frida, Ekdahl, Calle, Bore, Alexander   +3 more
core  

The First Detection of Molecular Activity in the Largest Known Oort Cloud Comet: ALMA Imaging of C/2014 UN271 (Bernardinelli–Bernstein) at 16.6 au from the Sun

The Astrophysical Journal Letters
We report observations of comet C/2014 UN271 (Bernardinelli–Bernstein) carried out on UT 2024 March 8 and 17 at a heliocentric distance ( r _H ) of 16.6 au using the Atacama Large Millimeter/submillimeter Array (ALMA).
Nathan X. Roth, Stefanie N. Milam, Martin A. Cordiner, Dominique Bockelée-Morvan, Nicolas Biver, Michael S. P. Kelley, Anthony J. Remijan, Steven B. Charnley, Carrie E. Holt, Kiernan D. Foster, Joseph Chatelain, Edward Gomez, Sarah Greenstreet, Tim Lister, Helen Usher   +14 more
doaj   +1 more source

Thermodynamic Assessment of Prebiotic Molecule Formation Pathways on Comets

Universe
Comets are chemically rich and thermally extreme, spanning surface temperatures from ~50 K in the Oort Cloud to >1000 K for sungrazing bodies. These conditions may support key steps of prebiotic chemistry, including the synthesis of nucleic acid ...
Luca Tonietti
doaj   +1 more source

The Impossibility of the Oort Cloud

The Oort Cloud hypothesis proposes a spherical shell of icy bodies extending from 2,000 to 200,000 AU, containing trillions of objects serving as the reservoir for long-period comets. Despite seven decades of acceptance, no direct observational evidence supports its existence. This paper presents three independent arguments demonstrating the Oort Cloud'
openaire   +1 more source

MOND, MONG and the Oort cloud

The definitive negative results of various direct searches for dark matter particles and non-observation of them has increasingly indicated that we should consider alternate models like the Modification of Newtonian Dynamics (MOND) and Modification of Newtonian Gravity (MONG).
C Sivaram, OV Kiren, Louise Rebecca, Arun Kenath   +3 more
openaire   +1 more source

From the grain to galactic scale; Milky Way neutral hydrogen and terrestrial zircon oxygen support coupling of astrophysical and geological processes over deep-time

Physical Review Research
Neutral hydrogen (HI) is fundamental for tracing spiral structure in galaxies, including the Milky Way, through its 21-cm emission line, revealing features otherwise obscured by dust and gas.
C. L. Kirkland, P. J. Sutton
doaj   +1 more source

Ryugu's nucleosynthetic heritage from the outskirts of the Solar System. [PDF]

Sci Adv, 2022
Hopp T, Dauphas N, Abe Y, Aléon J, O'D Alexander CM, Amari S, Amelin Y, Bajo KI, Bizzarro M, Bouvier A, Carlson RW, Chaussidon M, Choi BG, Davis AM, Di Rocco T, Fujiya W, Fukai R, Gautam I, Haba MK, Hibiya Y, Hidaka H, Homma H, Hoppe P, Huss GR, Ichida K, Iizuka T, Ireland TR, Ishikawa A, Ito M, Itoh S, Kawasaki N, Kita NT, Kitajima K, Kleine T, Komatani S, Krot AN, Liu MC, Masuda Y, McKeegan KD, Morita M, Motomura K, Moynier F, Nakai I, Nagashima K, Nesvorný D, Nguyen A, Nittler L, Onose M, Pack A, Park C, Piani L, Qin L, Russell SS, Sakamoto N, Schönbächler M, Tafla L, Tang H, Terada K, Terada Y, Usui T, Wada S, Wadhwa M, Walker RJ, Yamashita K, Yin QZ, Yokoyama T, Yoneda S, Young ED, Yui H, Zhang AC, Nakamura T, Naraoka H, Noguchi T, Okazaki R, Sakamoto K, Yabuta H, Abe M, Miyazaki A, Nakato A, Nishimura M, Okada T, Yada T, Yogata K, Nakazawa S, Saiki T, Tanaka S, Terui F, Tsuda Y, Watanabe SI, Yoshikawa M, Tachibana S, Yurimoto H.   +91 more
europepmc   +1 more source