Results 51 to 60 of about 40,765 (217)

Interstellar extinction and interstellar polarization: Old and new models [PDF]

Journal of Quantitative Spectroscopy and Radiative Transfer, 2012
The review contains an analysis of the observed and model curves of the interstellar extinction and polarization. The observations mainly give information on dust in diffuse and translucent interstellar clouds. The features of various dust grain models including spherical/non-spherical, homogeneous/inhomogeneous particles are discussed.
openaire   +2 more sources

On Graphite and Interstellar Extinction [PDF]

The Astrophysical Journal, 1965
Mie scattering calculation to support theory that interstellar extinction is caused by graphite ...
T. P. Stecher, B. Donn
openaire   +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

Interstellar extinction and polarization -- A spheroidal dust grain approach perspective

, 2010
We extend and investigate the spheroidal model of interstellar dust grains used to simultaneously interpret the observed interstellar extinction and polarization curves.
Anderson, Bessell, Carnochan, Clayton, Corradi, Coyne, Cutri, Das, Davis, Davis, Dobashi, Draine, Draine, Draine, Draine, Draine, Ducati, Fitzpatrick, Genova, Goodman, Gordon, Greenberg, Greenberg, Gupta, H. K. Das, Hanson, Hildebrand, Hong, Iatì, Il'in, Jones, Kim, Kim, Krełowski, Laor, Larson, Lasue, Lazarian, Lee, Li, Li, Li, Li, Li, Mamajek, Martin, Martin, Martin, Mathis, Mathis, Mathis, Mermilliod, Min, Monet, Moreno, N. V. Voshchinnikov, North, Onaka, Penprase, Platais, Rogers, Rouleau, Serkowski, Skiff, Snow, Snow, Sofia, Stark, Straizys, V. B. Il'in, Vaidya, Valencic, Vallée, Vallée, Voshchinnikov, Voshchinnikov, Voshchinnikov, Voshchinnikov, Voshchinnikov, Voshchinnikov, Voshchinnikov, Wegner, Weingartner, Welsh, Whittet, Wilking, Wilking, Wolf, Zubko, Zubko   +89 more
core   +1 more source

Expected value, to a point: Moral decision‐making under background uncertainty

Noûs, Volume 59, Issue 4, Page 1093-1125, December 2025.
Abstract Expected value maximization gives plausible guidance for moral decision‐making under uncertainty in many situations. But it has unappetizing implications in ‘Pascalian’ situations involving tiny probabilities of extreme outcomes. This paper shows, first, that under realistic levels of ‘background uncertainty’ about sources of value independent
Christian Tarsney
wiley   +1 more source

X-ray Halos and Large Grains in the Diffuse Interstellar Medium [PDF]

, 2001
Recent observations with dust detectors on board the interplanetary spacecraft Ulysses and Galileo have recorded a substantial flux of large interstellar grains with radii between 0.25 and 2.0 mu entering the solar system from the local interstellar ...
Adolf N. Witt, Anders E., Baguhl M., Eli Dwek, Landgraf M., Lehtinen K., Paresce F., Predehl P., Randall K. Smith, Smith R. K., Wiscombe W. J., Witte M.   +11 more
core   +2 more sources

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

Peculiar ultraviolet interstellar extinction

The Astrophysical Journal, 1983
In connection with investigations of the physical characteristics of interstellar dust, a study of objects with peculiar extinction might provide new insights about the composition, size distribution, formation, and destruction of the particulate matter. Meyer and Savage (1981) have found that the dust toward many stars exhibits peculiar UV extinction.
D. Massa, B. D. Savage, E. L. Fitzpatrick   +2 more
openaire   +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

The Optical -- Mid-infrared Extinction Law of the l=165 Sightline in the Galactic Plane: Diversity of Extinction Law in the Diffuse Interstellar Medium

, 2017
Understanding the effects of dust extinction is important to properly interpret observations. The optical total-to-selective extinction ratio, Rv = Av/E(B-V), is widely used to describe extinction variations in ultraviolet and optical bands. Since the Rv=
Chen, Xiaodian, de Grijs, Richard, Jiang, Biwei, Wang, Shu, Zhao, He   +4 more
core   +2 more sources