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The Basel Problem
We give a solution to the Basel problem, that \(\sum 1/n^2=\uppi /6\)...
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Black holes up close
Recent developments have ushered in a new era in the field of black-hole astrophysics, providing a direct view of the remarkable environment near...
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Manufacturing
The very high surface/volume ratio of human lungs (attributable to the presence of hundreds of millions of tiny alveoli) facilitates efficient gas...
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Atmospheric characterization of terrestrial exoplanets in the mid-infrared: biosignatures, habitability, and diversity
Exoplanet science is one of the most thriving fields of modern astrophysics. A major goal is the atmospheric characterization of dozens of small,...
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Probing a southern hemisphere VLBI Intensive baseline configuration for UT1 determination
The deviation of Universal Time from atomic time, expressed as UT1−UTC, reflects the irregularities of the Earth rotation speed and is key to precise...
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Continuum Study on Uranus at the Millimeter/Submillimeter Wavelength with ALMA Data
Uranus is a unique solar system body with its extreme rotational axis, low luminosity, asymmetrical internal magnetic field and magnetosphere, and...
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From Radar to Radio Astronomy
Today’s astronomers study the sky at a wide range of wavelengths, spread across the electromagnetic spectrum, from radio through microwave, infrared,...
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The nature of compact radio sources: the case of FR 0 radio galaxies
Radio-loud compact radio sources (CRSs) are characterised by morphological compactness of the jet structure centred on the active nucleus of the...
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Black Holes
This chapter describes the work done for the Nobel Prizes awarded in 2020 to R. Genzel, A. M. Ghez and R. Penrose. Their work relates to black holes,...
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The Astronomical Register
The appearance of The Astronomical Register in January of 1863 represents a pivotal-point in the development of British amateur astronomy. It aimed,...
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The Observer’s Distance
The paper aims at contributing to build a theoretical and critical toolkit to define and handle what could be considered contemporary homologous of...
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RELATIVE NAVIGATION AND POINTING ERROR BUDGET FOR AN X-RAY ASTRONOMY FORMATION-FLYING MISSION
This paper presents an error budget for the relative navigation and intersatellite pointing of a novel formation-flying mission, Cal X-1. Despite...
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A Message from Humanity
On the eve of St. Valentine’s Day 1990, a remarkable and unprecedented token of affection unfolded almost 3.7 billion miles (six billion kilometres)...
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Island Universes: The Marvels and Wonders of Galaxies
Look up at the night sky through a telescope and you see that not everything has the point-like appearance of a star: some celestial objects are...
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Science with the Daksha high energy transients mission
We present the science case for the proposed Daksha high energy transients mission. Daksha will comprise of two satellites covering the entire sky...
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Analysis of the ATLAS photometry of the dwarf planets (134340) Pluto and (136199) Eris
This manuscript analyzes forced photometry data of the dwarf planets Pluto and Eris obtained by the ATLAS network between 2015 and 2023 using the o-...
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Improvements and comparison of VLBI INT2 and INT3 session performance
One of the core products of VLBI is the rapid determination of the Earth rotation parameter, expressed through dUT1. Multiple so-called Intensive...
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Magnetic origin of the discrepancy between stellar limb-darkening models and observations
Stars appear darker at their limbs than at their disk centres because at the limb we are viewing the higher and cooler layers of stellar...
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The Bowl of Night – Spring and Summer
The starry sky has often been referred to as the bowl of night. Think of the sky as a hemispherical bowl whose edges touch the horizon all around...