Results 21 to 30 of about 93,784 (190)
Earth and Space Science, Volume 10, Issue 9, September 2023., 2023 Abstract Future exploration efforts of the Moon, Mars, and other bodies are poised to focus heavily on persistent and sustainable survey and research efforts, especially given the recent interest in a long‐term sustainable human presence at the Moon.
Prabal Saxena +14 more
wiley +1 more source
Quantifying the Hypervolatile Abundances in Jupiter-family Comet 46P/Wirtanen
The Planetary Science Journal, 2021 We present analysis of IR and optical spectroscopy of Jupiter-family comet (JFC) 46P/Wirtanen obtained in 2019 January, when the comet had sufficient geocentric velocity to enable studies of the hypervolatiles CO and CH4, as well as [O i] emission. These
A. McKay +10 more
semanticscholar +1 more source
Buried Ice Deposits in Lunar Polar Cold Traps Were Disrupted by Ballistic Sedimentation
Journal of Geophysical Research: Planets, Volume 128, Issue 5, May 2023., 2023 Abstract The NASA Artemis program will send humans to the lunar south polar region, in part to investigate the availability of water ice and other in situ resources. While trace amounts of ice have been detected at the surface of polar permanently shadowed regions (PSRs), recent studies suggest that large ice deposits could be stable below cold traps ...
C. J. Tai Udovicic +10 more
wiley +1 more source
Geophysical Research Letters, Volume 49, Issue 18, 28 September 2022., 2022 Abstract We report a world record of lidar profiling of metallic Ca+ ions up to 300 km in the midlatitude nighttime ionosphere during geomagnetic quiet time. Ca+ measurements (∼80–300 km) were made over Beijing (40.42°N, 116.02°E) with an Optical‐Parametric‐Oscillator‐based lidar from March 2020 through June 2021.
Jing Jiao +12 more
wiley +1 more source
Perspectives of Earth and Space Scientists, Volume 3, Issue 1, December 2022., 2022 Abstract These are my personal recollections of my 50‐year involvement in planning NASA space projects, including the Voyager Missions, The Hubble Space Telescope, the International Space Station, the Space Shuttle, the Falcon Space X launcher, and the James Webb Space Telescope.
Charles F. Kennel
wiley +1 more source
Perspectives of Earth and Space Scientists, Volume 3, Issue 1, December 2022., 2022 Abstract The first discovery of the space age was in the field of space physics and occurred with the Explorer 1 launch in 1958 and its observations of the radiation belts encircling Earth. Space physics remained a young science into 1981 when I started graduate school, so young that there were no comprehensive textbooks on the subject.
Mona Kessel
wiley +1 more source
Space in 150 years: From fantasy through fiction to fact and function [PDF]
, 2015 In the last century and a half, space has moved from the realm of fantasy to everyday reality. In parallel, the way space has been regarded by the person in the street and the ideas of what access to space might be used for have evolved extraordinarily.
Southwood, DJ
core +1 more source
Monthly notices of the Royal Astronomical Society, 2021 Photometric observations of the nearly equal-mass binary near-Earth asteroid 2017 YE5 were carried out at the Observatório Astronômico do Sertão de Itaparica (OASI, Brazil) and at the Blue Mountains Observatory (BMO, Australia) between 2018 July and ...
F. Monteiro +9 more
semanticscholar +1 more source
Photon rockets in (anti-)de Sitter universe [PDF]
Phys.Rev.D78:044029,2008, 2008 A class of exact solutions of Einstein's equations is presented which describes accelerating photon rockets in de Sitter and anti-de Sitter universe. These are particular members of the Robinson-Trautman family of axially symmetric spacetimes with pure radiation.
arxiv +1 more source
Photon rockets moving arbitrarily in any dimension [PDF]
Int.J.Mod.Phys.D20:335-360,2011, 2010 A family of explicit exact solutions of Einstein's equations in four and higher dimensions is studied which describes photon rockets accelerating due to an anisotropic emission of photons. It is possible to prescribe an arbitrary motion, so that the acceleration of the rocket need not be uniform - both its magnitude and direction may vary with time ...
arxiv +1 more source