Results 61 to 70 of about 31,858 (173)

Visionaries and Crackpots, Maniacs and Saints: Existential Risk and the Politics of Longtermism

Ratio, Volume 38, Issue 4, Page 268-278, December 2025.
ABSTRACT Despite advancing strong claims about our collective priorities, longtermism has received little attention in debates in political philosophy. I first provide an account of longtermism that highlights the way it departs from established work on intergenerational justice.
Alex McLaughlin
wiley   +1 more source

New Probable Dwarf Galaxies in Northern Groups of the Local Supercluster [PDF]

, 2007
We have searched for nearby dwarf galaxies in 27 northern groups with characteristic distances 8-15 Mpc based on the Second Palomar Sky Survey prints.
A. Klypin, B. Binggeli, D. I. Makarov, D. J. Pisano, D. J. Schlegel, E. Briggs, F. Zwicky, G. Vaucouleurs de, I. D. Karachentsev, I. D. Karachentsev, I. D. Karachentsev, I. D. Karachentsev, I. D. Karachentsev, I. D. Karachentsev, J. M. Shombert, N. Trentham, N. Trentham, R. M. Cutrie, S. Stierwalt, S. T. Gottesman, V. E. Karachentseva, V. E. Karachentseva, V. E. Karachentseva, W. K. Huchtmeier   +23 more
core   +1 more source

New Arabic Records From Cairo on Supernovae 1181 and 1006

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT The remnant of the historical supernova SN 1181 is under discussion: While the previously suggested G130.7+3.1 (3C58) appears too old (3000–5000 year), the unusual star IRAS00500+6713 with a surrounding nebula (Pa‐30) has an expansion age not inconsistent with a SN Iax explosion in ad 1181 under the assumption that neither acceleration nor ...
J. G. Fischer, H. Halm, R. Neuhäuser, D. L. Neuhäuser   +3 more
wiley   +1 more source

Addressing the core-cusp and diversity problem of dwarf and disk galaxies using cold collisionless DARKexp theory [PDF]

Journal of Cosmology and Astroparticle Physics
Abstract Dwarf galaxies are observed to have linearly rising rotation curves, which indicate constant density cores in their centers. These do not arise naturally from dark matter only simulations, giving rise to the “core-cusp” problem.
Liliya L. R. Williams, J. Hjorth, Evan D. Skillman   +2 more
openalex   +3 more sources

Environmental effects on star formation in dwarf galaxies and star clusters

, 2014
We develop a simple analytical criterion to investigate the role of the environment on the onset of star formation. We will consider the main external agents that influence the star formation (i.e.
Chiosi, C., Cropper, M., Fujita, Y., Grebel, E. K., Pasetto, S.   +4 more
core   +1 more source

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

HSTPROMO Internal Proper-motion Kinematics of Dwarf Spheroidal Galaxies. I. Velocity Anisotropy and Dark Matter Cusp Slope of Draco

The Astrophysical Journal
We analyze four epochs of Hubble Space Telescope imaging over 18 yr for the Draco dwarf spheroidal galaxy. We measure precise proper motions for hundreds of stars and combine these with existing line-of-sight (LOS) velocities.
Eduardo Vitral, Roeland P. van der Marel, Sangmo Tony Sohn, Mattia Libralato, Andrés del Pino, Laura L. Watkins, Andrea Bellini, Matthew G. Walker, Gurtina Besla, Marcel S. Pawlowski, Gary A. Mamon   +10 more
doaj   +1 more source

Tools for Learning—Promoting Reflection for Student Teachers' Development of PCK

Journal of Research in Science Teaching, Volume 62, Issue 8, Page 1902-1922, October 2025.
ABSTRACT This paper investigates how the coherent integration of three different tools for reflection during a science methods course can contribute to student teachers' planning and enactment of science teaching, that is, their development of pedagogical content knowledge (PCK).
Pernilla Nilsson, Anne‐Marie Cederqvist   +1 more
wiley   +1 more source

Probing late-time annihilations of oscillating asymmetric dark matter via rotation curves of galaxies

European Physical Journal C: Particles and Fields
In this paper, we explore the Oscillating Asymmetric Dark Matter (OADM) model to address the core-cusp problem, aiming to resolve the discrepancy between the predictions of the $$\Lambda \textrm{CDM}$$ Λ CDM cosmological model and the observed dark ...
Júlia G. Mamprim, Guillermo Gambini, Luan B. Arbeletche, Marcos Olegario, Vitor de Souza   +4 more
doaj   +1 more source

The Effect of Seductive Details on Knowledge Retention in Physics Videos: A Mixed Methods Study

Journal of Research in Science Teaching, Volume 62, Issue 8, Page 1923-1940, October 2025.
ABSTRACT Research reports that interesting but irrelevant information, seductive details, in teaching material can impede learning. In science education, the inclusion of historical narratives in lessons to promote interest has been recommended but may hinder learning.
Richard Brock, Liam Cini O'Dwyer, Ben Rogers   +2 more
wiley   +1 more source