Results 51 to 60 of about 46,765 (196)

The Astrobiology of Alien Worlds: Known and Unknown Forms of Life

Universe, 2020
Most definitions of life assume that, at a minimum, life is a physical form of matter distinct from its environment at a lower state of entropy than its surroundings, using energy from the environment for internal maintenance and activity, and capable of
Louis N. Irwin, Dirk Schulze-Makuch
doaj   +1 more source

Boundaries of photosynthesis: adaptations of carbon fixation in extreme environments

FEBS Open Bio, Volume 15, Issue 7, Page 1028-1040, July 2025.
Photosynthesis faces challenges from environmental extremes of temperature, pH, and salinity, limiting gas diffusion, modifying membrane fluidity, and destabilizing photochemical and biochemical reactions. Photosynthetic organisms have evolved unique adaptations overcoming these stresses and maintaining their photosynthetic activity.
Pere Aguiló‐Nicolau, Concepción Iñiguez, Sebastià Capó‐Bauçà, Jeroni Galmés   +3 more
wiley   +1 more source

Stellar Coronal and Wind Models: Impact on Exoplanets

, 2017
Surface magnetism is believed to be the main driver of coronal heating and stellar wind acceleration. Coronae are believed to be formed by plasma confined in closed magnetic coronal loops of the stars, with winds mainly originating in open magnetic field
A Maggio, A Morgenthaler, A Morgenthaler, A Reiners, A Reiners, A Reiners, A Strugarek, A Telleschi, A. Skumanich, AA Pevtsov, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA Vidotto, AA West, AF Lanza, B Holst van der, B Holst van der, B Zieger, BA Nicholson, BE Wood, BE Wood, BE Wood, BE Wood, BE Wood, BJ Wargelin, BO Demory, C Catala, C Garraffo, C Johnstone, C. P. Johnstone, CM Johns-Krull, CM Johns-Krull, CP Folsom, CP Johnstone, CP Johnstone, D Arzoumanian, D Bisikalo, D Buzasi, D Falceta-Gonçalves, D Lai, E Shkolnik, EF Guinan, EJ Gaidos, F Bagenal, G Anglada-Escudé, G Scandariato, GAJ Hussain, GAJ Hussain, GAJ Hussain, GHJ Oord van den, GW Pneuman, H Lammer, H Lammer, H Washimi, I Baraffe, I Pillitteri, I Ribas, I. Ribas, IA Waite, IA Waite, IA Waite, Ignasi Ribas, IV Sokolov, J Donati, J Donati, J Donati, J Donati, J Llama, J Morin, J Morin, J Morin, J Morin, J Sanz-Forcada, J Zendejas, Jackie Villadsen, JD Alvarado-Gómez, Jeremy Lim, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JF Donati, JH Debes, JI Zuluaga, JJG Lima, JM Grießmeier, JM Grießmeier, JV Hollweg, K Tsinganos, KG Kislyakova, L Hartmann, L. Mestel, M Guedel, M Guedel, M Güdel, M Jardine, M Jardine, MG Sterenborg, ML Khodachenko, ML Khodachenko, N Pizzolato, NJ Wright, O Cohen, O Cohen, O. Cohen, O. Cohen, P Lang, P Petit, P Petit, P Testa, R Fares, R Fares, R Fares, R Fares, R Keppens, R Pallavicini, RD Jeffries, Robert P. Kraft, Rui F. Pinto, RVE Lovelace, S Boro Saikia, S Boro Saikia, S Matt, S. V. Jeffers, SC Marsden, SC Marsden, SG Parsons, SH Yang, SK Solanki, SL Li, SP Matt, SR Cranmer, SR Cranmer, T Matsakos, T Matsumoto, Takuma Matsumoto, TE Holzer, Theresa Lüftinger, TK Suzuki, V Jatenco-Pereira, V Réville, V See, V. Bourrier, V. Bourrier, WH Ip   +162 more
core   +1 more source

Doppler-Shifted Alkali D Absorption as Indirect Evidence for Exomoons

Frontiers in Astronomy and Space Sciences, 2022
Sodium and potassium signatures in transiting exoplanets can be challenging to isolate from the stellar absorption lines. Here, these challenges are discussed in the framework of Solar System observations, and transits of Mercury in particular. Radiation
Carl A. Schmidt
doaj   +1 more source

Research Progress on Atmospheric Turbulence Perception and Correction Based on Adaptive Optics and Deep Learning

Advanced Photonics Research, Volume 6, Issue 7, July 2025.
This work presents a systematic review of atmospheric turbulence fundamentals, including theoretical formulations and adaptive optics‐based mitigation strategies. This includes an in‐depth examination of the devices, theories, and methodologies associated with traditional correction approaches.
Qinghui Liu, Yihang Di, Mengmeng Zhang, Zhenbo Ren, Jianglei Di, Jianlin Zhao   +5 more
wiley   +1 more source

CD-HPF: New Habitability Score Via Data Analytic Modeling

, 2016
The search for life on the planets outside the Solar System can be broadly classified into the following: looking for Earth-like conditions or the planets similar to the Earth (Earth similarity), and looking for the possibility of life in a form known or
Agrawal, Surbhi, Bora, Kakoli, Narasimhamurthy, Anand, Routh, Swati, Safonova, Margarita, Saha, Snehanshu   +5 more
core   +1 more source

The Eccentricity-Mass Distribution of Exoplanets: Signatures of Different Formation Mechanisms? [PDF]

, 2006
We examine the distributions of eccentricity and host star metallicity of exoplanets as a function of their mass. Planets with M sin i >~ 4 M_J have an eccentricity distribution consistent with that of binary stars, while planets with M sin i
Abt, Beaulieu, Black, Butler, Butler, Butler, Chiang, Close, Cumming, Endl, Fischer, Ford, Galland, González-García, Gould, Halbwachs, Halbwachs, Heacox, Holman, I. Ribas, J. Miralda-Escudé, Jones, Kley, Kozai, Lyo, Marcy, Marcy, Mayor, McCaughrean, Nordström, Papaloizou, Papaloizou, Pinsonneault, Pinsonneault, Pollack, Pourbaix, Rees, Stepinski, Stepinski, Tabachnik, Takeda, Tohline, Tremaine, Udry, Valenti, Vogt   +45 more
core   +2 more sources

Exoplanet Two-Square Degree Survey With SAO RAS Robotic Facilities

Frontiers in Astronomy and Space Sciences, 2022
We used the 0.5-m robotic telescope located at the Special Astrophysical Observatory of the Russian Academy of Sciences for monitoring two square degrees of the sky with the aim of detecting new exoplanets. A dimming of the visible brightness is expected
Oleg Ya. Yakovlev, Oleg Ya. Yakovlev, Azamat F. Valeev, Azamat F. Valeev, Azamat F. Valeev, Gennady G. Valyavin, Alexander V. Tavrov, Alexander V. Tavrov, Vitaly N. Aitov, Guram Sh. Mitiani, Oleg I. Korablev, Gazinur A. Galazutdinov, Gazinur A. Galazutdinov, Grigory M. Beskin, Eduard V. Emelianov, Timur A. Fatkhullin, Valery V. Vlasyuk, Vyacheslav V. Sasyuk, Alexei V. Perkov, Sergei Bondar, Tatyana E. Burlakova, Tatyana E. Burlakova, Sergei N. Fabrika, Iosif I. Romanyuk   +23 more
doaj   +1 more source

Zehn Jahre Gaia‐Messungen: Die hochgenaue Kartierung des Himmels

Physik in unserer Zeit, Volume 56, Issue 4, Page 175-183, July 2025.
Das astrometrische Weltraumobservatorium Gaia der Europäischen Weltraumorganisation hat die astrometrische Forschung revolutioniert, indem es unter anderem präzise Positionen, Bewegungen und Entfernungen von fast zwei Milliarden Himmelsobjekten gemessen hat. Damit stellt es wertvolle Daten für fast alle Gebiete der Astrophysik bereit. Nach dem Ende der
Stefan Jordan
wiley   +1 more source

The effects of stellar winds and magnetic fields on exoplanets

, 2013
The great majority of exoplanets discovered so far are orbiting cool, low-mass stars whose properties are relatively similar to the Sun. However, the stellar magnetism of these stars can be significantly different from the solar one, both in topology and
Vidotto, A. A.
core   +1 more source