The Science of Life – From Earth to the Stars

Exoplanets

The Fermi Paradox Reconsidered: Why the Silence May Be Expected

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This silence at the heart of the cosmos defines the Fermi Paradox The question of why, if intelligent life is common, we detect none of it. When Enrico Fermi posed his famous question—“Where is everybody?”—during a 1950 lunchtime conversation at Los Alamos, the underlying logic seemed compelling. The Milky Way contains hundreds of billions of stars, many of which are older than the Sun. If even a small fraction of hosts have technological civilizations, the galaxy should be teeming with detectable activity. The apparent absence of such activity is what we now call the Fermi Paradox. However, framing this absence as a paradox relies on a chain of weakly supported Read more

HD 137010 b Kepler discovery - Scientific visualization of the system

Kepler-442b: Why It Remains a Strong Habitable-World Candidate

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Kepler-442b is a habitable exoplanet 1,200 light-years away in the constellation Lyra. By one of the most rigorous mathematical measures of similarity to Earth, it is among the closest matches ever confirmed. Orbiting a calm, long-lived star in the habitable zone, it receives about 70 percent of the sunlight that warms our oceans. Its radius suggests it is likely rocky. Scientists assigned it an Earth Similarity Index score of 0.84, extraordinary given that Earth itself scores a perfect 1.0. Despite this, the Kepler-442b habitable exoplanet remains largely obscure. This gap between its potential significance and its limited attention reveals how exoplanet science and its narratives develop. Kepler-442b was found in Read more

A prism diamond on a CD reflects rainbow colors, with water droplets enhancing the light display.

PSR J2322-2650b: Why This Pulsar Planet Is So Unusual

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Imagine a world where the sky is choked with carbon soot, where the core may be packed with diamonds under unimaginable pressure, and where a full year lasts less than eight hours. Imagine this PSR J2322-2650b diamond planet is not a sphere but a lemon, stretched and squeezed by the gravitational grip of a stellar corpse the size of a city yet as massive as the Sun itself. This is not science fiction. This is PSR J2322-2650b, and astronomers who first analyzed its data had one collective reaction: “What the heck is this?” Announced in late 2025 and published in The Astrophysical Journal Letters, the discovery of PSR J2322-2650b represents Read more

HD 137010 b: How a PhD Student Found a Hidden Planet in Kepler’s Archive

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It sat unnoticed in the archive. In 2017, NASA’s Kepler Space Telescope recorded a faint, ten-hour shadow crossing HD 137010, 146 light-years away, before it vanished. What would become known as the HD 137010 b Kepler discovery began with a single overlooked data point. The automated detection algorithms that sweep Kepler data for planets recorded only a single event and moved on. Finding a planet requires multiple transits; one shadow could be anything. It took a PhD student nearly a decade to look again. Alexander Venner, digging through archival Kepler data, noticed that solitary dip. He ran the numbers. The geometry fit a planet roughly the size of Earth, orbiting Read more

TOI-700 e TESS discovery - Artist illustration of the TOI-700 system

TOI-700 e TESS Discovery: Two Earths in One Habitable Zone

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The TOI-700 e TESS discovery has revealed a remarkable planetary system. Imagine standing on a planet where the sun never moves. It hangs fixed on the horizon, or directly overhead, or just below the edge of the world, forever. Half your planet is scorched in perpetual noon; the other half is locked in unending night. At the terminator, the thin line between those two extremes, temperatures might be just right. While this dramatic scenario describes one possibility for tidally locked worlds, modern climate models suggest the reality could be more nuanced and potentially more welcoming. And now imagine that a few million miles away, another world orbits the same star Read more

Natural and False Color Views of Europa. A bright, smooth surface fractured by long, dark lines and ridges.

Beyond the Habitable Zone: Ocean Worlds and the New Search for Life

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Beyond the Habitable Zone: Ocean Worlds and the New Search for Life For decades, the search for life beyond the habitable zone and extraterrestrial life has been guided by a single, elegant idea: look for planets in the habitable zone. This region around a star, often called the Goldilocks zone, marks the narrow orbital band where temperatures allow liquid water to pool on a world’s surface. Not too hot, not too cold. It’s a powerful concept that helped astronomers prioritize thousands of exoplanet candidates discovered by missions like Kepler and TESS. But the Goldilocks zone was always a framework built around a single data point: Earth. Now, a growing body Read more

Concept illustration of biosignature detection on an exoplanet

False Biosignatures: When Planets Mimic the Signs of Life

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The search for life beyond Earth has entered a transformative era. Powerful observatories such as the James Webb Space Telescope (JWST) are now capable of performing JWST studies of exoplanet atmospheres, revealing the chemical fingerprints of worlds orbiting stars many light-years away. One of the central goals of this research is to identify alien biosignatures, measurable indicators that may suggest the presence of life. Yet detecting life across interstellar distances is extraordinarily challenging. Many atmospheric signals that appear biological can also arise from non-biological processes. These misleading indicators, known as false biosignatures, represent one of the most important challenges in modern astrobiology. Understanding false biosignatures is essential for interpreting exoplanet Read more

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