Results 51 to 60 of about 211,186 (262)

Unveiling Illumination Variations During a Lunar Eclipse: Multi-Wavelength Spaceborne Observations of the January 21, 2019 Event

Remote Sensing
Space-based observations of the total lunar eclipse on 21 January 2019 were conducted using the geostationary Earth-orbiting satellite Gaofen-4 (GF-4). This study represents a pioneering effort to address the observational gap in full-disk lunar eclipse ...
Min Shu, Tianyi Xu, Wei Cai, Shibo Wen, Hengyue Jiao, Yunzhao Wu   +5 more
doaj   +1 more source

Quick response targeting program [PDF]

, 1971
Computer program generates and verifies operational launch vehicle targeting presettings for lunar free-return missions and lunar landing missions. Program is applicable in astronomy and nuclear physics, and in areas where improved targeting techniques ...
Bosley, J. T.
core   +1 more source

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Small but mighty: Impact hazards from iron Near‐Earth Objects

Meteoritics &Planetary Science, EarlyView.
Abstract Small asteroids can impact Earth unexpectedly, as demonstrated by the Chelyabinsk event in 2013. The warning times are likely to be short, and the first tools for fast hazard predictions have been developed in the last years for encounters with rocky or cometary objects, which quickly fragment in the atmosphere and cause airbursts. However, in
Robert Luther, Natalia Artemieva, Andrea Schmalen, Kai Wünnemann, Detlef Koschny, Richard Moissl   +5 more
wiley   +1 more source

Sampling the volcanic plumes at Io: Impact speeds and shock conditions

Meteoritics &Planetary Science, EarlyView.
Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell, R. C. Ogliore, P. J. Wozniakiewicz   +2 more
wiley   +1 more source

Dust Outburst Dynamics and Hazard Assessment for Close Spacecraft–Comet Encounters

The Planetary Science Journal, 2021
Using the gas drag by sublimating cometary surface ices for the acceleration of dust particles and deceleration by the gravity field of the nucleus combined with basic laws of mechanics, the sizes, velocities, and number densities of escaping particles ...
Uwe Fink, Walter Harris, Lyn Doose, Kat Volk, Laura Woodney, Tony Farnham, Maria Womack   +6 more
doaj   +1 more source

"Bridging the Gap" through Australian Cultural Astronomy [PDF]

, 2011
For more than 50,000 years, Indigenous Australians have incorporated celestial events into their oral traditions and used the motions of celestial bodies for navigation, time-keeping, food economics, and social structure.
Hamacher, Duane W., Norris, Ray P.
core   +2 more sources

Moon's volcanic history revealed in glassy spherules from Apollo 17 soil 76501

Meteoritics &Planetary Science, EarlyView.
Abstract Rapidly quenched droplets of pyroclastically erupted lava are common in lunar regolith at landing sites proximal to the maria. Here, we document the U‐Pb chronologies, major element, and trace element compositions of picritic glassy particles from Apollo 17 regolith sample 76501. These particles are dominated by high‐Ti compositions similar to
Alexander A. Nemchin, Marc D. Norman, Martin J. Whitehouse, Evgenia Salin, Nicholas E. Timms, Tao Long, Xiaochao Che, Renaud Merle, Fred Jourdan, Tao Luo   +9 more
wiley   +1 more source

How middle level science teachers visualize and translate motion, scale, and geometric space of the Earth-Moon-Sun system with their students

Physical Review Physics Education Research, 2018
[This paper is part of the Focused Collection on Astronomy Education Research.] We examined teachers’ spatial-scientific reasoning and the alternative conceptions they held regarding Earth-space content. While participating in a professional development (
Jennifer Wilhelm, Merryn Cole, Cheryl Cohen, Rebecca Lindell   +3 more
doaj   +1 more source

Large-scale array for radio astronomy on the farside (LARAF) [PDF]

Philosophical Transactions of the Royal Society A
At the Royal Society meeting in 2023, we have mainly presented our lunar orbit array concept called DSL, and also briefly introduced a concept of a lunar surface array, LARAF.
Xuelei Chen, Feng Gao, Fengquan Wu, Yechi Zhang, Tong Wang, Weilin Liu, Dali Zou, Furen Deng, Yan Gong, Kai He, Jixia Li, Shijie Sun, Nanben Suo, Yougang Wang, Pengju Wu, Jiaqin Xu, Yidong Xu, Bin Yue, Cong Zhang, Jia Zhou, Minquan Zhou, Chenguang Zhu, Jiacong Zhu   +22 more
semanticscholar   +1 more source