Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"terrestrial planets"”.
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Hydrocode modeling of oblique impacts into terrestrial planets
… can chemically equilibrate deep in a terrestrial magma ocean.</p> <p>The largest known impact on the Moon formed the South Pole-Aitken (SP-A) basin and excavated material as deep as the mantle. Here I suggest that large impacts eject enough material to cover the farside of the Moon. …
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Experimental investigations of differentiation processes in the terrestrial planets
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Petrological and rheological controls on volcanism to terrestrial planets
Through experimental petrology and geodynamic modeling, processes of melting under thick lithospheres on the Earth and the moon are investigated. Phase equilibrium experiments were carried out on Apollo 14B and 15C picritic glasses (Chapters 5 and 6) and on a Sierran high-potassium lava (Chapter …
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Physical and chemical constraints on core - mantle differentiation in terrestrial planets.
… differentiation occurred on Earth and terrestrial planets. The wetting characteristics of liquid Fe-Si alloys in a matrix of the respective predominating stable silicate mantle mineral (forsterite, silicate perovskite) at pressures of 2-5 and 25 GPa and temperatures of 1600-2000°C have …
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The Early Evolution of Terrestrial Planets: Impact Simulations and Planetary Chemistry
Large impacts early in the lifetime of a terrestrial planet can transform its surface environment and interior composition, with the potential to forever change the evolutionary pathways available to that world. The chemically reduced metallic iron cores of these large impactors are key to such …
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Optimising the Detection of Temperate, Terrestrial Planets around Ultra-Cool Dwarfs with SPECULOOS
… as part of the SPECULOOS (Search for habitable Planets EClipsing ULtra-cOOl Stars) team to optimise the detection potential of Earth-sized, habitable-zone planets transiting ultra-cool dwarfs (UCDs) from the ground. These cool, red dwarfs are small, abundant, and predicted to host a wealth of …
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Last Call for Life: Habitability of Terrestrial Planets Orbiting Red Giants and White Dwarfs
… giant, and then later a white dwarf. To search planets in these systems for signs of life it is essential that we understand how stellar evolution influences atmospheric photochemistry along with detectable biosignatures. We use EXO-Prime, which consists of a 1D coupled climate/photochemistry …
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The consequences of cometary and asteroidal impacts on the volatile inventories of the terrestrial planets
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Studies of large volcanoes on the terrestrial planets : implications for stress state, tectonics, structural evolutions, and moat filling
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
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Planetary Materials Science and Astrobiology
… to interpret diverse planetary materials: terrestrial rocks and meteorites. In this thesis, detailed mineralogical and chemical study of various planetary materials have enabled some new constraints to be placed on asteroidal melting and shock metamorphic processes, the nature of habitable …
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Characterization and modeling of materials responsible for planetary crustal magnetism
Earth and Mercury are the only terrestrial planets in our solar system with present-day magnetic dipole fields generated by internal dynamo systems. In contrast, Mars and the Moon show evidence of past dipole fields in the form of crustal magnetic anomalies; to hold measurable magnetizations, crustal …
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Infrasound Propagation in Terrestrial Planetary Atmospheres
… are present (and may be detected) on other terrestrial planets with similar atmospheric structures.</p> <p>Using a one-dimensional, nonlinear, compressible atmospheric acoustics model, this thesis seeks to investigate the propagation and dissipation of atmospheric acoustic waves in different …
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Direct numerical simulations of multiphase flow with applications to basaltic volcanism and planetary evolution
… of volcanic eruptions, shape the landscape of terrestrial planets, and govern subsurface flow in hydrocarbon reservoirs. Advancing our fundamental understanding and predictive capabilities of multiphase flows is a problem of immense importance for both industrial and scientific purposes. This …
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Exploring the Enstatite Chondrites: Modal Abundances, Metamorphic History, and Volatile Challenges
… demonstrating that most detected hydrogen (H) is terrestrial contamination rather than indigenous. However, modeling the H budget of an EC-like parent body suggests a potential contribution to Earth's water budget. Combined, these findings contribute to a more nuanced understanding of EC …
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Autocorrelation Analysis of the Seismic Data Recorded on Mars
There are eight planets in our solar system, which can be divided into two categories, terrestrial planets and Jovian planets. Mars, the last terrestrial planet away from the sun, is the target we want to investigate in this thesis. Mars has a very thin atmosphere and ice caps in its polar areas. …
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Isotopes as a Tool for Exploring Exoplanet Atmospheres
… of ¹³CO₂ in the atmospheres of temperate terrestrial and sub-Neptune sized planets and assess its suitability as a biosignature gas. While the search for signs of life has focused on terrestrial planets around M dwarf stars, an unambiguous detection of life—including through …
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On the Application of Machine Learning to Planetary Sciences
… learning is applied to improve the realism of terrestrial planet formation studies by streamlining high-resolution collision simulations into machine learned response functions. A more realistic treatment of collisions in N-body terrestrial planet formation studies is found to profoundly affect …
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The Influence of Curvature on Mantle Convection featuring a Temperature-dependent Viscosity
… in the silicate mantles or ice layers of terrestrial planets and moons is characterized by a strongly temperature-dependent viscosity. Mantle convection regime is first examined in 2D and 3D spherical geometry with varying mantle curvature (core-to-surface radii-ratio, f) and constant …
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Modeling and Observing Atmospheres of Terrestrial Exoplanets
… Telescope (JWST) allows us to observe more exoplanets and in greater detail. Now that we can characterize terrestrial planets and their atmospheres, this dissertation features several theoretical works that study atmospheric dynamics and infer observability. First, we explore the processes of …
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Plume formation in strongly temperature-dependent viscosity fluids: Application to early Mars
… into the early history of Mars as well as other terrestrial planets including Earth. We develop a hypothesis that the dichotomy is caused by an early transient superplume produced by a hot Martian core. At first glance, the superplume hypothesis seems unlikely because the number of plumes in …
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