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The existence of planes of satellites has been a cosmological surprise. However, evidence for stable, long-lived satellite planes is generally tenuous, and they are unexpected in all current models of galaxy formation.
In the past 20 years, the discovery and characterization of the smallest galaxies have pushed the edges of observational endeavours and theoretical advancements alike, and they will continue to be at the forefront of this field for years to come.
The authors report the linear correlation of X-ray and Hα surface brightnesses in the material stripped from a galaxy, providing evidence for the mixing of galactic interstellar and hot intra-cluster medium as the origin of the multi-phase stripped tails observed previously.
Alongside its role in astronomical research, the newly commissioned 32-m radio telescope is being used as an outreach tool for astronomy education in Ghana. The observatory also serves as a facility for international postgraduate programmes.
A high-frequency quasiperiodic oscillation in the soft X-rays from unusual transient AT2018cow points towards the presence of a compact object in the remnant: either a neutron star with spin period of 4 ms or a low-mass black hole.
An energetic eruptive filament on EK Draconis most probably launched a coronal mass ejection with a mass ten times larger than the largest solar coronal mass ejection. Studying such ejections provides insight into stellar angular momentum loss and the habitability of orbiting planets.
Combining polarimetry with space-based photometry and archival spectroscopy has given us an unprecedented understanding of the characteristics and interior structure of the bright β Cephei-type variable star β Crucis.
Unlocking the internal secrets of a β Cephei star with a state-of-the-art polarimeter may open up a greater understanding of whether a massive star eventually explodes in a supernova or collapses directly to a black hole.
The Zhurong rover has explored its landing site in Utopia Planitia, Mars, and is travelling south towards the highland–lowland boundary, focusing initially on the composition and physical properties of the rocks along the way.
Averting the imminent climate crisis requires large reductions in greenhouse gas emissions within this decade. To provide a benchmark for reduction and to identify the main sources, we estimate the carbon footprint of astronomy research in the Netherlands over 2019.
This Article reports the detection of oscillations in the massive star β Crucis using polarized light. Such oscillatory modes provide information about stellar structure; in this case the stellar mass, inclination of the rotation axis and size of the convective core.
The authors report time-series interferometric observations of a microlensing event from the ground. The lens images rotate during the series, giving the direction of motion of the lens and a very accurate Einstein ring radius. The lens is a 1.1-solar mass object at a distance of 5–6 kpc.
The 20-million-year-old, solar-type star V1298 Tau hosts a multiplanet system. The two outermost planets, gas giants with masses of 0.64 and 1.16 Jupiter masses, respectively, defy current formation models as their mass–radius relationship should be reached much later in the stages of planetary evolution.
Water and hydroxyl enrichment in the solar-wind-irradiated rim of an olivine grain from asteroid Itokawa suggests that its regolith could contain ~20 l m−3 of water from solar wind—a potential water source for airless planetary bodies.