Atomic and gravitational clocks
Atomic and Gravitational Metrics in Cosmology
Atomic diffusion coefficients calculated for transition metals in olivine
Atoms of Silence
ATP Assay of Terrestrial Soils: A Test of an Exobiological Experiment
Attempt at a classical cancellation of the cosmological constant
Attempt at dust debris collection with stacked detectors (A0138-2)
attempted prebiotic synthesis of pseudouridine
Attenuated Total Reflection as an In Situ Infrared Spectroscopic Method for Mineral Identification
Attenuation differences in layer 2A in intermediate- and slow-spreading oceanic crust
Attitude determination of stratospheric balloons using Kalman filters
Attractor in a superstring model: The Einstein theory, the Friedmann universe, and inflation
ATV "Jules Verne" Tests Campaign at ESA
Aureole deposits of the Martian volcano Olympus Mons
Aureum Chaos - Evidence from water-related minerals
Aurora
Aurora Australis
Aurora of July 7
Aurora of November 15
Auroral and Non-auroral X-ray Emissions from Jupiter: A Comparative View