Results 61 to 70 of about 473,596 (201)
Method for observing the features characterizing the surface of a land mass [PDF]
, 1980 A method is described where a propeller driven, hydrazine powered aircraft is remotely piloted through rarefied atmosphere of a selected planet, including the planet Earth.
Reed, R. D.
core +1 more source
Orbital migration of low-mass planets in evolutionary radiative models: Avoiding catastrophic infall
, 2010 Outward migration of low-mass planets has recently been shown to be a possibility in non-barotropic disks. We examine the consequences of this result in evolutionary models of protoplanetary disks.
Baruteau +8 more
core +1 more source
A Candidate Location for Planet Nine from an Interstellar Meteoroid: The Messenger Hypothesis
The Astrophysical Journal, 2023 The existence of a hypothetical Planet Nine lurking in the outer solar system has been invoked as a plausible explanation for the anomalous clustering in the orbits of trans-Neptunian objects.
Hector Socas-Navarro
doaj +1 more source
Rapid Water Loss can Extend the Lifetime of the Planetary Habitability [PDF]
, 2015 Two habitable planetary states are proposed: an aqua planet like the Earth and a land planet that has a small amount of water. Land planets keep liquid water under larger solar radiation compared to aqua planets. Water loss may change an aqua planet into a land planet, and the planet can remain habitable for a longer time than had it stayed an aqua ...
arxiv +1 more source
Origin and early evolution of terrestrial planet atmospheres and oceans
Terrestrial, Atmospheric and Oceanic Sciences, 2019 Planet atmospheric compositions are determined by the availability of a gas species, its molecular weight and the mass (or gravity force) of a planet. Both Mercury and the Moon are not massive enough to hold any gas species to form an atmosphere.
Lin-gun Liu
doaj +1 more source
An Earth-sized Planet around an M5 Dwarf Star at 22 pc
The Astronomical Journal, 2023 We report on the discovery of an Earth-sized transiting planet ( R _p = 1.015 ± 0.051 R _⊕ ) in a P = 4.02 day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc.
Teruyuki Hirano +48 more
doaj +1 more source
Terrestrial Planet Formation in the Presence of Migrating Super-earths [PDF]
, 2014 Super-Earths with orbital periods less than 100 days are extremely abundant around Sun-like stars. It is unlikely that these planets formed at their current locations. Rather, they likely formed at large distances from the star and subsequently migrated inward. Here we use N-body simulations to study the effect of super-Earths on the accretion of rocky
arxiv +1 more source
, 2012 In their model for the origin of the parent bodies of iron meteorites, Bottke et al proposed differentiated planetesimals that were formed in the region of 1-2 AU during the first 1.5 Myr, as the parent bodies, and suggested that these objects and their ...
Bland +19 more
core +1 more source
Caliban: French Journal of English Studies, 2019 Le film de science-fiction de Ridley Scott, The Martian/Seul sur Mars (2015) joue sur plusieurs sources d'intérêt pour le spectateur. D'une part le film comporte de brillantes séquences consacrées à la technologie de la NASA telles que la récupération du
Raphaëlle Costa de Beauregard
doaj +1 more source
Extrasolar Binary Planets I: Formation by tidal capture during planet-planet scattering [PDF]
, 2014 We have investigated i) the formation of gravitationally bounded pairs of gas-giant planets (which we call "binary planets") from capturing each other through planet-planet dynamical tide during their close encounters and ii) the following long-term orbital evolution due to planet-planet and planet-star {\it quasi-static} tides.
arxiv +1 more source