Results 11 to 20 of about 89,600 (153)

Radial Distribution of Production Rates, Loss Rates and Densities Corresponding to Ion Masses <=40 amu in the Inner Coma of Comet Halley: Composition and Chemistry

, 2005
In this paper we have studied the chemistry of C, H, N, O, and S compounds corresponding to ions of masses
Allen, Altwegg, Altwegg, Altwegg, Anicich, Anicich, Anicich, Anil Bhardwaj, Balsiger, Balsiger, Bhardwaj, Bhardwaj, Bhardwaj, Bhardwaj, Bhardwaj, Bhardwaj, Bhardwaj, Bhardwaj, Boice, Crovisier, Eberhardt, Eberhardt, Eberhardt, Eberhardt, Festou, Festou, Geiss, Gringauz, Haberli, Haberli, Haider, Haider, Huebner, Huebner, Huebner, Ip, Khare, Korth, Krankowsky, Marconi, Marconi, Marconi, Marconi, Meier, Meier, Mendis, Michael, Millar, Mitchell, Mitchell, Mitchell, Murad, Rao, Reme, S.A. Haider, Schmidt, Slanina, Wegmann, Wegmann   +58 more
core   +1 more source

Solar Sails : Technology and demonstration status [PDF]

, 2012
Solar Sail propulsion has been validated in space (IKAROS, 2012) and soon several more solar-sail propelled spacecraft will be flown. Using sunlight for spacecraft propulsion is not a new idea.
Barnes, Nathan, Friedman, Louis, Johnson, Les, Lappas, Vaios, McInnes, Colin, Young, Roy   +5 more
core   +1 more source

Comets, historical records and vedic literature

, 2018
A verse in book I of Rigveda mentions a cosmic tree with rope-like aerial roots held up in the sky. Such an imagery might have ensued from the appearance of a comet having `tree stem' like tail, with branched out portions resembling aerial roots ...
A Hiltebeitel, A Parpola, A Sachs, AG Pingre, BV Subbarayappa, DE Pingree, DK Yeomans, DK Yeomans, DR Brown, DW Hughes, FR Stephenson, FR Stephenson, GW Kronk, I Hasegawa, I Hasegawa, I Mahadevan, J Williams, JK Fotheringham, KD Abhyankar, L Achmad, M Miki, M Yano, NK Chandel, PY Ho, R Kochhar, RH Allen, RN Iyengar, RN Iyengar, RN Iyengar, S Kanda, SD Sharma, W Robertson, WS Tsu, Z Xu   +33 more
core   +1 more source

Inelastic Dissipation in Wobbling Asteroids and Comets [PDF]

, 1998
Asteroids and comets dissipate energy when they rotate about the axis different from the axis of the maximal moment of inertia. We show that the most efficient internal relaxation happens at the double frequency of body's tumbling.
A. Lazarian, Hudson, M. Efroimsky, Ostro, Ostro   +4 more
core   +3 more sources

Tähistaeval põhinevatest uskumustest III Vana-Hiina [PDF]

Mäetagused, 2002
The article concerns Chinese astral myths, calendar and astrology. Chinese creation myths concern also the creation of the Sun, Moon and stars. The heavenly bodies are constantly endangered by the sky dragon that now and then catches them, probably a ...
Enn Kasak
doaj  

Solar Sailing: applications and technology advancement [PDF]

, 2011
Harnessing the power of the Sun to propel a spacecraft may appear somewhat ambitious and the observation that light exerts a force contradicts everyday experiences.
Macdonald, Malcolm
core   +2 more sources

Convening Black Sociability Over a Corpse: Obituaries in the Early South African Black Press

Media and Communication
This article explores the significance of obituaries in the early 20th-century black press in South Africa, particularly focusing on how they served as a medium for memorializing black excellence within a context of colonization and oppression.
Lesley Mofokeng
doaj   +1 more source

Second‐Scale Formation of Non‐Field‐Aligned Plasma Irregularities Observed From a High‐Altitude 43‐Cassiopeiids Fireball

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract High‐altitude optical meteors initiating above 150 km are exceedingly rare, with confirmed observations largely confined to the Leonids. Using the Meteor and ionospheric Irregularity Observation System, we recorded a bright 43‐Cassiopeiids fireball with heterogeneous material. It initiated luminously at an exceptional altitude of 157.8 ± $\pm $
Yi Li, Guozhu Li, Zhi Wu, Wenzhi Chen, Zhaoguo Huang, Lianhuan Hu, Xiukuan Zhao, Wenjie Sun, Haiyong Xie, Guofeng Dai, Jianfei Liu, Baiqi Ning, Shoumin Chang   +12 more
wiley   +1 more source

Relaxation of Wobbling Asteroids and Comets. Theoretical Problems. Perspectives of Experimental Observation

, 2001
A body dissipates energy when it freely rotates about any axis different from principal. This entails relaxation, i.e., decrease of the rotational energy, with the angular momentum preserved.
Asphaug, Asphaug, Asphaug, Belton, Black, Bottke, Bottke, Bottke, Bottke, Burns, Burns, Burns, Burns, Efroimsky, Efroimsky, Fowles, Giblin, Giblin, Goldreich, Harris, Harris, Houpis, Hudson, Jacobi, Julian, Klinger, Knopoff, Lambeck, Lamy, Landau, Landau, Lazarian, Lazarian, Meech, Melosh, Michael Efroimsky, Muinonen, Nowick, Ostro, Ostro, Ostro, Ostro, Peale, Peale, Peale, Peale, Pravec, Prendergast, Prialnik, Prokof'eva, Prokof'eva, Purcell, Remo, Richardson, Rickman, Sagdeev, Samarasinha, Samarasinha, Samarasinha, Samarasinha, Scheeres, Stacey, Veverka, Wilhelm, Yeomans, Yeomans, Yoder, Yoder, ”Opik   +68 more
core   +1 more source

Transport of Water in a Transient, Impact‐Generated Atmosphere on Mercury

Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.
Abstract Mercury's polar cold traps host water ice deposits that are likely populated with impact‐delivered water via Mercury's exosphere. However, Mercury's near‐sun location experiences an extremely high photodestruction rate that rapidly destroys water with a timescale of only ∼3.5 hr.
J. K. Steckloff, D. B. Goldstein, P. L. Varghese, L. M. Trafton, P. Prem   +4 more
wiley   +1 more source