Photon Density and the Gamma-Ray Flux at a Point in an Expanding Universe

Photon geodesics in Friedmann-Robertson-Walkercosmologies

Photon-photon optical depth for gamma-ray bursts

Photon/proton ratio as a diagnostic tool for topological defects as the sources of extremely high-energy cosmic rays

Photonic Acceleration in Astrophysics

Photoproduction of carbon monoxide in first-year sea ice in Franklin Bay, southeastern Beaufort Sea

Photoproduction of carbonyl sulfide in south Pacific Ocean waters as a function of irradiation wavelength

Photoreductive dissolution of ferrihydrite by methanesulfinic acid: Evidence of a direct link between dimethylsulfide and iron-bioavailability

Photosynthesis via Mineral Fluorescence in Harsh UV Radiation Environments

Photosynthesis: Likelihood of Occurrence and Possibility of Detection on Earth-like Planets

Photosynthetic microbial mats in the 3,416-Myr-old ocean

Phyllosilicate Deposits in Shalbatana Vallis

Phyllosilicates and Other Hydrated Minerals on Mars: 2. Detailed Analysis

Phyllosilicates and other hydrous minerals on Mars as seen by MEx/OMEGA and MRO/CRISM: global scale distribution and the discovery of hydrous mineral deposits in northern plain craters.

Phyllosilicates in Nili Fossae

Phyllosilicates in the matrix of the unique carbonaceous chondrite, LEW 85332 and possible implications for the aqueous alteration of CI chondrites

Phyllosilicates in the Mawrth Vallis Region, Mars, as Seen by OMEGA and HRSC/Mars Express

Phyllosilicates on Mars and implications for early martian climate

Phyllosillicates and Low Calcium Pyroxene-rich Noachian Crust Exposures in the Walls of Valles Marineris, Mars

Physical and biological mechanisms for planetary waves in ocean colour