Results 31 to 40 of about 123,895 (209)

Impact Momentum Transfer—Insights from Numerical Simulation of Impacts on Large Boulders of Asteroids

The Planetary Science Journal
Asteroids pose potential hazards to Earth. The recent NASA Double Asteroid Redirection Test mission successfully demonstrated the change of an asteroid’s orbit by a kinetic impactor.
Kaiyi Dai, Xi-Zi Luo, Meng-Hua Zhu, Gareth S. Collins, Thomas Davison, Robert Luther, Kai Wünnemann   +6 more
doaj   +1 more source

Thrust analysis of rocket landing on planetary granular surfaces [PDF]

EPJ Web of Conferences
We systematically investigate the thrust exerted by a high-speed air jet using laboratory experiments. The study considers smooth and bumpy rigid plates, as well as a deformable granular bed that simulates planetary surfaces.
Sonar Prasad Ranganath, Katsuragi Hiroaki   +1 more
doaj   +1 more source

Exoplanet Terra Incognita

, 2018
Exoplanet surface imaging, cartography and the search for exolife are the next frontiers of planetology and astrophysics. Here we present an over-view of ideas and techniques to resolve albedo features on exoplanetary surfaces.
A Carbognani, B-O Demory, C Burke, C Maccone, D Morrison, D Sirbu, DM Fluri, F Feng, F Pont, G Anglada-Escudé, H Kawahara, HA Knutson, HN Russell, IAG Snellen, IJM Crossfield, IJM Crossfield, J Harrington, J Krissansen-Totton, JC Schwartz, JL Grenfell, M Bonnefoy, M Kaasalainen, MF Sterzik, MW Buie, NB Cowan, NB Cowan, P Ingraham, R Heller, R Heller, SV Berdyugina, SV Berdyugina, SV Berdyugina, SV Berdyugina, T Karalidi, TM Evans, VR Eshleman, VS Meadows, Y Fujii   +37 more
core   +1 more source

Multiple Overspill Flood Channels from Young Craters Require Surface Melting and Hundreds of Meters of Midlatitude Ice Late in Mars’s History

The Planetary Science Journal
Mars’s tadpole craters are small, young craters whose crater rims are incised by one or more exit breaches but lack visible inlets. The tadpole-forming climate records the poorly understood drying of Mars since the Early Hesperian.
Alexandra O. Warren, Sharon A. Wilson, Alan Howard, Axel Noblet, Edwin S. Kite   +4 more
doaj   +1 more source

Backscattering of Ions Impacting Ganymede’s Surface as a Source for Energetic Neutral Atoms

The Astrophysical Journal Letters
Jupiter’s largest moon Ganymede has its own intrinsic magnetic field, which forms a magnetosphere that is embedded within Jupiter’s corotating magnetospheric plasma.
Paul S. Szabo, Andrew R. Poppe, Andreas Mutzke, Lucas Liuzzo, Shane R. Carberry Mogan   +4 more
doaj   +1 more source

Space Robotics: Robotic Rovers for Planetary Exploration

International Journal of Advanced Robotic Systems, 2008
In this third of three short papers, I introduce some of the basic concepts of planetary rovers with an emphasis on some specific challenging areas of research that are peculiar to planetary robotics and not usually associated with terrestrial mobile ...
Alex Ellery
doaj  

Resonant Removal of Exomoons During Planetary Migration [PDF]

, 2015
Jupiter and Saturn play host to an impressive array of satellites, making it reasonable to suspect that similar systems of moons might exist around giant extrasolar planets.
Adams, Fred C., Batygin, Konstantin, Spalding, Christopher   +2 more
core   +2 more sources

Geometric Parameters of Cutting Tools that Can be Used for Forming Sided Surfaces with Variable Profile

Archives of Metallurgy and Materials, 2017
This article describes machining technology of polyhedral surfaces with varying profile, which is provided by planetary motion of multiblade block tools. The features of the technology and urgency of the problem is indicated.
Razumov M., Grechukhin A., Maslennikov A.   +2 more
doaj   +1 more source

Crater Retention Timescales of Brain Coral Terrain Record Past Climatic Change on Mars

The Planetary Science Journal
Glacial landforms on Mars offer an opportunity to decipher the planet’s recent climate history. We used crater size frequency distributions of brain coral terrain on concentric crater fill, lobate debris aprons, and lineated valley fill, all of which ...
Alexander M. Morgan, Eldar Z. Noe Dobrea, Kyle A. Pearson, Alphan Altinok   +3 more
doaj   +1 more source

Review and Revision of the Lunar Cratering Chronology—Lunar Timescale Part 2

The Planetary Science Journal, 2023
Times and rates of planetary surface-modifying processes are crucial for the sequence and correlation of events on planetary bodies. For most planetary surfaces, superposition principles and crater densities are commonly used methods to collect relative ...
Stephanie C. Werner, Benjamin Bultel, Tobias Rolf   +2 more
doaj   +1 more source