Results 81 to 90 of about 1,546,467 (200)
Constraining Electron‐Impact Ionization of O2 Through UV Aurora Observations at Ganymede
Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.Abstract While photoionization rates of Ganymede's O2 ${\mathrm{O}}_{2}$ dominated atmosphere are well constrained, the contribution of electron‐impact ionization is rather uncertain. Previous quantitative estimates have relied on assumptions about densities and energy distributions of precipitating electrons, or on rare spacecraft measurements that ...
Stefan Duling +5 more
wiley +1 more source
The Astrophysical JournalAbsolute distances from strong lensing can anchor Type Ia Supernovae (SNe Ia) at cosmological distances giving a model-independent inference of the Hubble constant ( H _0 ).
Xiaolei Li +3 more
doaj +1 more source
, 2008 Hubble site this is a collection of all publicly released pictures from the Hubble Space Telescope. Accompanying each photograph is the official news release, an introduction to the object, fast facts, and related frequently asked questions.
core
Calculation of the Hubble Constant and the Minimum Mass
, 2023 Calculation of the Hubble Constant and the Minimum Mass Using the Dirac’s Hypothesis on the Ratio of the Electrostatic Force to the Gravitational ...
Paul Talbot
core +1 more source
The Hubble Constant: A Historical Review
, 2023 For 100 years since galaxies were found to be flying apart from each other, astronomers have been trying to determine how fast. The expansion, characterized by the Hubble constant, H0, is confused locally by peculiar velocities caused by gravitational ...
Tully, R. Brent
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On the dark radiation role in the Hubble constant tension
, 2023 Dark radiation, parameterized in terms of $N_{\rm eff}$, has been considered many times in the literature as a possible remedy in alleviating the Hubble constant ($H_0$) tension.
Mena, Olga, Gariazzo, Stefano
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A Whole Cosmology View of the Hubble Constant
, 2023 The Hubble constant $H_0$ is the value of the cosmic expansion rate at one time (the present), and cannot be adjusted successfully without taking into account the entire expansion history and cosmology.
Linder, Eric V.
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Hints of New Physics for the Hubble Tension: Violation of Cosmological Principle
The Astrophysical Journal LettersDiscrepancy between the measurements of Hubble constant H _0 from the cosmic microwave background and the local distance ladder is the most serious challenge to the standard ΛCDM model.
J. P. Hu, X. D. Jia, J. Hu, F. Y. Wang
doaj +1 more source
The Hubble constant troubled by dark matter in non-standard cosmologies. [PDF]
Sci Rep, 2022 Alcaniz JS +5 more
europepmc +1 more source
Determining Cosmological-model-independent H 0 with Gravitationally Lensed Supernova Refsdal
The Astrophysical JournalThe reappearance of supernova Refsdal with detailed modeling of the lens cluster allows us to measure the time-delay distance, which serves as a powerful tool to determine the Hubble constant ( H _0 ).
Xiaolei Li, Kai Liao
doaj +1 more source