Sökning: "John Hayes"

Hittade 2 avhandlingar innehållade orden John Hayes.

1. 1. The Search for Life on Mars - Preparation for Sample Return

   Författare :Tomas Hode; Stefan Bengtson; John Hayes; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap;

   Sammanfattning : The purpose of the thesis work has been to develop methods and concepts to aid in the search, detection and assessment of ancient microfossils here on Earth as a guide to the search for ancient life on Mars. The intention has been to identify and characterize environments on Earth that may be considered analogous to Martian environments and in which fossil preservation is expected to be good, and to develop and apply methods to characterize the isotopic and chemical composition of possible traces of life in order to assess their biogenicity and biological affinities. LÄS MER

3. 2. Neutral gas properties of high-redshift analog galaxies : 21cm observations of Lyα and LyC-emitting galaxies

   Författare :Alexandra Le Reste; Matthew J. Hayes; John Cannon; Rychard Bouwens; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Galaxies; Lyman alpha; Lyman Continuum; 21cm line; Interacting galaxies; Epoch of Reionization; Astronomy; astronomi;

   Sammanfattning : Neutral hydrogen (HI) is the most abundant baryonic element and a crucial component of galaxies. In the early universe, the interaction between neutral gas and the light produced by galaxies is thought to have given rise to cosmological reionization. LÄS MER