Exoplanet systems as a research area investigate the formation, architecture, dynamics, and physical properties of planetary systems orbiting stars other than the Sun, integrating observational, theoretical, and computational approaches. The field encompasses detection techniques (e.g., transits, radial velocities, direct imaging, microlensing), characterization of planetary masses, radii, atmospheres, and orbits, and statistical studies of population demographics as functions of stellar type, metallicity, and environment. It also addresses disk–planet interactions, migration processes, multi-planet dynamics, and stability, with implications for planet formation theories, comparative planetology, and the occurrence and potential habitability of terrestrial and giant planets in diverse stellar contexts.
Observations with the James Webb Space Telescope (JWST) have provided new clues about how the exoplanet WASP-121b has formed and where it might have originated in the disk of gas and dust around its star. These insights stem ...
Planetary Sciences
Jun 3, 2025
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The search for life beyond Earth is a key driver of modern astronomy and planetary science. The U.S. is building multiple major telescopes and planetary probes to advance this search. However, the signs of life—called biosignatures—that ...
Astrobiology
Jun 2, 2025
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Exoplanet science is shifting from finding any detectable exoplanets we can to searching for those in their stars' habitable zones. NASA's proposed Habitable World Observatory and other similar efforts are focused on these ...
Astrobiology
Jun 2, 2025
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The search for life on other worlds needs a way to sift through the chemistry of their atmospheres. If another species observed Earth to search for life, they'd look for "smoking gun" chemistry in the atmosphere. That includes ...
Astrobiology
Jun 2, 2025
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Just because we can find ozone in the atmosphere of other planets doesn't mean there's life. Ozone is a sign of life on Earth, but its detection on Venus shows that it can also be produced abiotically. This indicates that ...
Astrobiology
May 30, 2025
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The search for extraterrestrial life has long gone back and forth between scientific curiosity, public fascination and outright skepticism. Recently, scientists claimed the "strongest evidence" of life on a distant exoplanet—a ...
Astrobiology
May 28, 2025
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In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and planetary masses silently orbit their stars—sometimes thousands of astronomical units (AU) away. For years, ...
Astronomy
May 27, 2025
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When astronomers announced last month they might have discovered the most promising hints of alien life yet on a distant planet, the rare good news raised hopes humanity could soon learn we are not alone in the universe.
Astronomy
May 24, 2025
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270
Co-paired stars, or stars that travel together, can provide insights into processes that other stars can't. Differences in their brightness, orbits, and chemical composition can hint at different features, and scientists ...
Astronomy
May 22, 2025
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A small international team of astronomers has confirmed that a binary star system with an odd signal has a companion—a planet roughly twice the size of Jupiter, which may have emerged from a circumbinary orbit or from a second-generation ...
