Sökning: "Planets"

Visar resultat 1 - 5 av 79 avhandlingar innehållade ordet Planets.

  1. 1. The Formation of Giant Planets

    Författare :Michiel Lambrechts; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Planet formation; Solar System; Exoplanets; Giant planets; Hydrodynamics;

    Sammanfattning : Giant planets form embedded in a protoplanetary disc around a young star. Close to the midplane a large fraction of the available mass in solids is found in particles of cm to dm in size, which drift towards the star due to friction with the surrounding gas. LÄS MER

  3. 2. De stationibus planetarum determinandis disquisitiones quarum partem primam ven. ampl. facult. philos. Upsal. p. p. ... Ericus Almqvist Norrlandus et Tönnes Hellm. Wrangel comes, stip. Helmfeldt. Smolandus. In audit. Gust. die IX Dec. MDCCCXXX. H. A. M. S

    Författare :Erik Almquist; Tönnes Helmut Wrangel; Erik Almquist; Uppsala universitet; []
    Nyckelord :Solar system; Planets; Science; Methodology; Science; Solar system; Planets; Solsystemet; Planetsystemet; Naturvetenskap;

    Sammanfattning : .... LÄS MER

  4. 3. Instrumentation for energetic Neutral atom measurements at Mars, Venus and The Earth

    Författare :Klas Brinkfeldt; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Energetic neutral atoms; instruments and techniques; mass spectrometry; microchannel plates; solid state detectors; solar wind interaction; planets; magnetosphere; exosphere; ring current; Space physics; Rymdfysik;

    Sammanfattning : This thesis deals with the development and calibrations of sensors to measure energetic neutral atoms (ENAs) at Mars, Venus, and the Earth. ENAs are formed in charge exchange processes between energetic, singly--charged ions and a cold neutral gas. LÄS MER

  5. 4. Formation of Pebble-Pile Planetesimals and the Interior Structure of Comets

    Författare :Karl Wahlberg Jansson; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; planets and satellites: formation; minor planets; asteroids: general; comets: general;

    Sammanfattning : Planets form in protoplanetary discs of gas, dust and ice around newborn stars. In the Solar System, not only planets are found as a result from the time of planet formation, but also remnant planetesimals in the form of asteroids, Kuiper belt objects and comets. Recent observations, e.g. LÄS MER

  7. 5. Formation and Early Evolution of Planetary Systems

    Författare :Daniel Carrera; Astronomi - Genomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; planet formation; planets and satellites: dynamical evolution and stability -- planets and satellites: gaseous planets -- planets and satellites: terrestrial planets; planets and satellites: terrestrial planets;

    Sammanfattning : Over the past 20 years we have discovered that exoplanets are common in the Galaxy, and are far more diverse than anyone expected. Half of all Sun-like stars are accompanied by at least one super-Earth (a planet with a size between Earth and Neptune), many planets have very high eccentricities indicative of a dynamical origin, and a small fraction of stars are accompanied by hot Jupiters, whose origin is poorly understood. LÄS MER