This Week in Astronomy: New skepticism surrounds the potential biosignatures detected on exoplanet K2-18b, as revised analyses question the strength and interpretation of the chemical evidence. Meanwhile, theorists explore the idea that primordial black holes—stabilized by a “memory burden” effect—could be the true nature of dark matter, with future gravitational wave observatories poised to test this. Separately, new findings suggest that a massive ancient impact may have triggered the Moon’s now-lost magnetic field.

In this week, we'll be covering:

Martian Slope Streaks Likely Caused by Dust, Not Water;
Moon's Uneven Interior Explains Nearside-Farside Differences,
Evolving Dark Matter May Help Solve the Hubble Tension.

In this week, we'll be covering:

Venus Crust May Be Active Without Plate Tectonics;
Roman Telescope Set to Uncover Hidden Rogue Planets;
Uncovering the Moon's Hidden History with LUGO.

In this week, we'll be covering:

NASA's SPHEREx Begins Mapping the Invisible Universe;
Tracking Space Objects Through Sound;
Blazing Light from Cosmic Darkness.

In this week, we'll be covering:

New Horizons Unveils First Lyman-Alpha Map of the Galaxy;
Eos: A Hidden Giant Hydrogen Cloud Near Earth;
Black Hole Dissonance Mystery Solved.

In this week, we'll be covering:

Beneath the Surface of Mars;
When Mars Had Rain;
CHAMPS: Delivering Small Payloads to Mars.

In this wekk, we'll be covering:

Echoes from the Cosmic Dawn;
The Hidden Life of Red Galaxies;
Perseverance Uncovers Martian History.

In this week we'll be covering:

HALO Module Arrives in U.S., Advancing Lunar Gateway Construction;
Warming Mars with Nanotech
A Universe Without Dark Matter or Dark Energy.

Dive into the hidden rhythms of the galaxy! This episode explores how Kepler's second life, the K2 mission, revealed the 'starquakes' of distant stars, unlocking secrets about their evolution and the Milky Way's history. Discover how these stellar vibrations act as cosmic time capsules, allowing astronomers to trace the galaxy's formation.

In this week we'll be covering:

Dark Matter's Hidden Influence on Planets;
Electrodynamic Shield Fights Lunar Dust;
Magnetic Forces and Star Formation in Sagittarius C.