Episode Details

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Today's topics:

Cotton-candy super-puff exoplanets - Astronomers report two rare “super-puff” exoplanets, TOI-791 b and c, that are Jupiter-sized yet astonishingly low-density. The find adds fresh pressure on planet-formation and atmospheric-inflation models, and sets up prime targets for future Webb follow-up.

Rocket Lab launches SAR imaging - Rocket Lab’s Electron is set to launch the “Ten Owl of Ten” mission, adding a Synspective Strix synthetic-aperture radar satellite to orbit. SAR imaging boosts disaster response and infrastructure monitoring because it can see through clouds and at night.

Exploding rocket bodies worsen debris - A new brief highlights multiple in-orbit breakups of Chinese rocket bodies, producing long-lived debris that can persist for decades at higher altitudes. The story underscores how leftover upper stages can become fragmentation hazards for everyone operating in LEO.

Botswana signs the Artemis Accords - Botswana is poised to become the 68th signatory of the Artemis Accords, joining a growing coalition shaping norms for peaceful and transparent civil space exploration. The move signals expanding African participation in space governance and diplomacy.

Strawberry Moon and planet trio - Late June skywatching features the bright “Strawberry Moon” plus an easy-to-spot grouping of Mercury, Venus, and Jupiter low after sunset. It’s a timely reminder that many of today’s space headlines connect directly to what you can see tonight.

Episode Transcript

Cotton-candy super-puff exoplanets
We’ll start with the strangest headline of the day: two “super-puff” exoplanets, TOI-791 b and TOI-791 c. They’re described as roughly Jupiter-sized, but with such tiny mass for their size that their overall densities come out lower than cotton candy. The system was first flagged by NASA’s TESS planet-hunting survey, then pinned down with follow-up observations that helped estimate size and mass. What makes this especially intriguing is that super-puffs are already rare—and finding two in the same system gives researchers a valuable comparison set. The big question now is how these planets stay so inflated: is it unusual atmospheric heating, an odd formation history, or something else keeping their envelopes puffed up despite not being classic “hot Jupiter” scorchers.

Rocket Lab launches SAR imaging
Next, launch news with a practical payoff back on Earth. Rocket Lab is preparing its Electron rocket for the “Ten Owl of Ten” mission from New Zealand, carrying a Synspective Strix synthetic-aperture radar satellite. SAR satellites don’t need daylight and they don’t care about cloud cover, because they actively transmit radar pulses and measure the return signal. That makes them extremely useful for rapid mapping after floods, earthquakes, and storms, and for quieter long-term monitoring like detecting ground subsidence or infrastructure shifts. Adding another satellite to Synspective’s constellation mainly means better coverage and faster revisits—more c