The study examines aerosol optical depth (AOD) measurements at 320 nm wavelength by a Brewer MKIII spectrophotometer located in Hobart, Australia. A climatology was developed from records encompassing the period April 4, 2002, to February 27, 2019. methodology is described extract cloudless episodes and half-days. Extraterrestrial irradiances are obtained using travelling calibration standard s...

To draw humankind's attention to its existence, an extraterrestrial civilization could well direct periodic laser pulses toward Earth. We developed a technique capable of detecting a quasi-periodic light signal with an average of less than one photon per pulse within a measurement time of a few tens of milliseconds in the presence of the radiation emitted by an exoplanet's host star. Each of th...

The era of outer planet orbiters (Galileo, Juno and Cassini) is advancing our understanding how the radiation belts Jupiter Saturn are structured, form evolve well beyond what had been possible during age flyby missions ground-based observations. nearly two decades-long datasets these missions, in context detailed long-term observations Earth's belts, highlight which processes that accelerate p...

The development of arid zone geomorphology has progressed over the past century from ground-level observations of a limited number of locations through the field traverse mapping of sizeable arid areas to a broad-scale overview of global desert regions assisted by aerial photography and satellite imagery. Extraterrestrial investigations of planetary surfaces and landforms have proceeded in exac...

The recent claim to have discovered evidence of extraterrestrial life on a meteorite from Mars is not compelling, but the study nevertheless has useful heuristic value.