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In this episode of SpaceTime, we delve into groundbreaking advancements in our understanding of gravity, the intriguing thermal characteristics of the Moon, and the discovery of white dwarf pulsars.
A New Theory of Gravity
Scientists have proposed a revolutionary new theory of gravity that brings us closer to the long-sought theory of everything. This quantum theory of gravity aims to unify gravity with the fundamental forces of nature, offering potential solutions to some of the most profound questions in physics, including the nature of dark matter and dark energy. We explore the implications of this theory and how it could reshape our understanding of the universe's origins and the behavior of black holes.
The Moon's Hot Side
Recent findings suggest that the Moon's near side is significantly hotter than its far side, with temperatures reaching up to 170 degrees Celsius higher. This research, based on data from NASA's GRAIL mission, reveals how geological differences between the lunar sides could be attributed to thermal variations in the Moon's mantle. We discuss the potential for these methods to enhance our understanding of other celestial bodies, including Mars and the moons of Jupiter and Saturn.
White Dwarf Pulsars: A Stellar Discovery
Astronomers have made a remarkable discovery of a white dwarf star that emits radio pulses, challenging the notion that only neutron stars can produce such signals. This discovery, reported in Nature Astronomy, opens up new avenues for understanding pulsar mechanisms and their sources across the Milky Way. We examine the significance of this finding and what it means for our knowledge of stellar evolution.
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✍️ Episode References
Reports on Progress in Physics
https://iopscience.iop.org/journal/0034-4885
Nature
https://www.nature.com/nature/
Nature Astronomy
https://www.nature.com/natureastronomy/
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00:00 This is Space Time Series 28, Episode 65 for broadcast on 30 May 2025
01:00 New theory of gravity
12:15 The Moon's thermal characteristics
22:30 Discovery of white dwarf pulsars
30:00 Skywatch: June night skies and the Taurids meteor shower

Jonathan Rauch, "Cross Purposes: Christianity's Broken Bargain with Democracy" (Yale UP, 2025)