Results 81 to 90 of about 37,989 (204)

Formation of Asteroid (16) Psyche by a Giant Impact

Journal of Geophysical Research: Planets, Volume 131, Issue 1, January 2026.
Abstract Asteroid (16) Psyche is the largest likely metal‐rich asteroid in the Solar System and the target of the NASA Psyche mission. The mission aims to determine whether the asteroid is the core of a differentiated planetesimal that lost its mantle via a giant impact.
Saverio Cambioni, Benjamin P. Weiss, Namya Baijal, Robert Melikyan, Erik Asphaug, John B. Biersteker, Richard P. Binzel, William F. Bottke, Samuel W. Courville, Linda T. Elkins‐Tanton, David J. Lawrence, José M. G. Merayo, Carol A. Raymond, Mark A. Wieczorek, Maria T. Zuber   +14 more
wiley   +1 more source

Where are the Fossils of the First Galaxies? II. True Fossils, Ghost Halos, and the Missing Bright Satellites

, 2011
We use a new set of cold dark matter simulations of the local universe to investigate the distribution of fossils of primordial dwarf galaxies within, and around the Milky Way.
Abazajian, Barkana, Belokurov, Belokurov, Bovill, Bovill, Bozek, Brown, Brown, Brown, Bullock, Bullock, Ciardi, de Jong, Efstathiou, Frebel, Geha, Haiman, Irwin, Karachentsev, Karachentsev, Klypin, Knollmann, Koposov, Machacek, Maio, Martinez, Massimo Ricotti, McGaugh, McGaugh, Mia S. Bovill, Monelli, Moore, Naab, Norris, O’Shea, Peebles, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Ricotti, Sand, Simon, Simon, Smith, Tinker, Tollerud, Trenti, Tully, Venkatesan, Walker, Walker, Walsh, Walsh, Whalen, Willman, Willman, Willman, Wise, Wise, Zentner, Zucker, Zucker   +64 more
core   +1 more source

Evolution of Terrestrial Planetary Bodies and Implications for Habitability

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood, Eva E. Stüeken, Priyadarshi Chowdhury, Chris J. Hawkesworth, Jacob A. Mulder   +4 more
wiley   +1 more source

Star formation in disk galaxies driven by primordial H_2

, 1997
We show that gaseous \HI disks of primordial composition irradiated by an external radiation field can develop a multiphase medium with temperatures between 10^2 and 10^4 K due to the formation of molecular hydrogen.
Abgrall H., Babul A., Daniele Galli, de Blok W. J. G., de Jong T., Edvige Corbelli, Efstathiou G., Flower D. R., Francesco Palla, Haiman Z., Kauffmann G., Seaton M. F., Wishart A. W.   +12 more
core   +1 more source

A new genus of jumping spiders (Araneae: Salticidae) inhabiting the South Island New Zealand rocky alpine zone

New Zealand Journal of Zoology, Volume 52, Issue 5, Page 716-795, December 2025.
ABSTRACT The spider family Salticidae (jumping spiders) is among the most heavily researched groups of invertebrates globally. Nevertheless, in Aotearoa New Zealand most species have never been studied. While it is estimated that approximately 200 endemic salticid species are found across the country, only around 50 have been described and fewer than ...
Robin G. Long, Cor J. Vink, Adrian M. Paterson   +2 more
wiley   +1 more source

Primordial seeds of supermassive black holes

, 2012
Supermassive black holes exist in the centers of galaxies, including Milky Way, but there is no compelling theory of their formation. Furthermore, observations of quasars imply that supermassive black holes have already existed at some very high ...
Kawasaki, Masahiro, Kusenko, Alexander, Yanagida, Tsutomu T.   +2 more
core   +1 more source

Climate Emergency and Different Ways to Fail? The Fermi Paradox, the Simulation Hypothesis, Agency and Hope

Journal for the Theory of Social Behaviour, Volume 55, Issue 4, December 2025.
ABSTRACT Humanity seems stuck on different ways to fail to meet the challenge posed by a declared climate emergency and manifest problems of ecological breakdown. Rather than reprise these failures, we use the Fermi Paradox and simulation hypothesis to make a simple point about agency. The argument unfolds in two sections.
Jamie Morgan
wiley   +1 more source

FAST H i 21 cm Study of Blueberry Galaxies

The Astrophysical Journal Letters
Green Peas (GPs) and blueberry galaxies (BBs) are thought to be local analogs ( z < 0.1) of high redshift Ly α emitters. H i study of these can help us understand the star formation in the primordial Universe.
Yogesh Chandola, Chao-Wei Tsai, D. J. Saikia, Guodong Li, Di Li, Yin-Zhe Ma   +5 more
doaj   +1 more source

Supermassive Dark Stars and Their Remnants as a Possible Solution to Three Recent Cosmic Dawn Puzzles

Universe
The James Webb Space Telescope (JWST) has begun to revolutionize our view of the Cosmos. The discovery of Blue Monsters (i.e., ultra-compact yet very bright high-z galaxies) and the Little Red Dots (i.e., very compact dustless strong Balmer break cosmic ...
Cosmin Ilie, Jillian Paulin, Andreea Petric, Katherine Freese   +3 more
doaj   +1 more source

Gravitational waves from primordial black holes and new weak scale phenomena

Physics Letters B, 2017
We entertain the possibility that primordial black holes of mass ∼(1026–1029) g, with Schwarzschild radii of O(cm), constitute ∼10% or more of cosmic dark matter, as allowed by various constraints.
Hooman Davoudiasl, Pier Paolo Giardino
doaj   +1 more source