The study of ultraluminous X-ray sources (ULXs) has changed dramatically over the last
decade. In this review we first describe the most important observations of ULXs in various …

Abstract Launched on 12 Aug. 2018, NASA's Parker Solar Probe had completed 13 of its
scheduled 24 orbits around the Sun by Nov. 2022. The mission's primary science goal is to …

Abstract We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio
source located at the position of the supermassive black hole Sagittarius A*(Sgr A*) …

A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and
accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a …

Most of the light from blazars, active galactic nuclei with jets of magnetized plasma that point
nearly along the line of sight, is produced by high-energy particles, up to around 1 TeV …

Abstract Imaging X-ray Polarimetry Explorer (IXPE) is a Small Explorer mission by NASA
and Agenzia Spaziale Italiana, launched on 2021 December 9, dedicated to investigating X …

INTRODUCTION Neutrinos are tracers of cosmic-ray acceleration: electrically neutral and
traveling at nearly the speed of light, they can escape the densest environments and may be …

Abstract GRB 221009A (z= 0.151) is one of the closest known long γ-ray bursts (GRBs). Its
extreme brightness across all electromagnetic wavelengths provides an unprecedented …

Axions and other very light axion-like particles appear in many extensions of the Standard
Model, and are leading candidates to compose part or all of the missing matter of the …