Stellar Encounters: A Second Collision of Galaxy Giants

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In this episode of SpaceTime, we explore groundbreaking discoveries and significant events unfolding in our universe.
Galactic Collision Course: Two Massive Galaxy Clusters Set for Round Two
Astronomers have observed a rare cosmic event as two massive galaxy clusters, previously collided, are now on a trajectory for another encounter. Located 2.8 billion light-years away, the clusters—designated PSE2G 181.06.48.47—exhibit fascinating structures and shock fronts indicative of their impending collision. We delve into the implications of this rare event and what it reveals about the dynamics of galaxy clusters and dark matter.
NASA's Psyche Mission Switches to Backup Systems
NASA has been compelled to switch to a backup fuel system on its Psyche spacecraft after a drop in fuel pressure was detected in the main propulsion system. We discuss the technical challenges faced by the mission team, the significance of the asteroid Psyche, and what this means for the spacecraft's journey to explore this intriguing metallic asteroid, scheduled for arrival in 2029.
Discovery of a New Atomic Nucleus
For the first time in over three decades, scientists have measured the heaviest nucleus decaying through proton emission. This discovery, involving the lightest known isotope of astatine-188, sheds light on the rare form of radioactive decay and the intricate properties of exotic nuclei. We explore the experimental techniques used and the theoretical implications of this groundbreaking finding.
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✍️ Episode References
Astrophysical Journal
https://iopscience.iop.org/journal/0004-637X
NASA Psyche Mission
https://www.nasa.gov/psyche
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00:00 This is Space Time Series 28, Episode 71 for broadcast on 13 June 2025
01:00 Galactic collision course: Two massive galaxy clusters set for round two
12:15 NASA's Psyche mission switches to backup systems
22:30 Discovery of a new atomic nucleus
30:00 Science report: Unprecedented ocean warming in the South Pacific