Results 31 to 40 of about 50,536 (153)
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 +12 more
wiley +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 +4 more
wiley +1 more source
Archives of impact: The politics of craters on Earth
Geographical Research, Volume 64, Issue 2, May 2026.This paper examines Earth’s 195 confirmed impact craters as archives, exploring their cataloguing and presentation as heritage sites. It argues Western scientific framings using military language and emphasising catastrophe overlook settler colonialism’s violent histories and marginalise indigenous earth‐sky cosmologies.
Gareth Hoskins
wiley +1 more source
Opportunities for ballistic missions to Halley's comet [PDF]
, 1977 Alternative strategies for ballistic missions to Halley's comet in 1985-86 are described. A large scientific return would be acquired from a ballistic Halley intercept in spite of the high flyby speeds that are associated with this mission mode.
Wooden, W. H., II, Farquhar, R. W.
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Journal of Geophysical Research: Planets, Volume 131, Issue 3, March 2026.Abstract From 1974 to 1975, the Mariner 10 spacecraft studied Mercury's environment during three flybys and detected hydrogen, helium, and possibly atomic oxygen in the exosphere using its ultraviolet spectrometer, but no molecular hydrogen. Based on the sensitivity of the occultation instrument, an upper limit for the H2 ${\mathrm{H}}_{2}$ surface ...
F. Weichbold +8 more
wiley +1 more source
Ion Propulsion Module (IPM) technology readiness assessment: 1985 Halley's Comet rendezvous mission [PDF]
, 1977 An assessment of the risk of utilizing ion propulsion to perform a rendezvous mission with Halley's comet in 1985 is presented, and consideration recommendations for reducing identified risks to the lowest possible level at project start in October 1978 ...
West, J.
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Comet Halley near the Pleiades Cluster in the early morning
, 2021 Mount Stromlo and Siding Spring Observatory - Site, Models of Telescopes, Opening of Siding 2.3m Telescope, Halley's Comet - The Rt. Hon. R. J.
Photographer: Roger Brissenden
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Evidence of an Extended Alfvén Wing System at Enceladus: Cassini's Multi‐Instrument Observations
Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.Abstract We report in situ evidence for Enceladus' Alfvén wing system and its coupling with Saturn's ionosphere, based on multi‐instrument observations from the Cassini spacecraft. Analysis of 36 events, including 13 from non‐flyby paths, confirms the existence of a Main Alfvén Wing (MAW) current system generated at Enceladus, and associated Reflected ...
L. Z. Hadid +28 more
wiley +1 more source
Halley's comet 1985-86: space exploration [PDF]
, 1980 A coordinated program to explore Halley's comet in 1985 to 86 is proposed. The program employs a variety of observational systems for remote observations and utilizes spacecraft encounters with the comet to obtain in-situ measurements.
Wooden, W. H., II, Farquhar, R. W.
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