Planets

Blog about planets.

Two views of Saturn obtained with the Hubble Space Telescope. On the right, a view of the planet's south pole, with the decagon that is the subject of this study

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An article published in the journal “Science Advances” reports the discovery of a decagon-shaped structure at the planet Saturn’s south pole. A team of researchers led by Professor Agustín Sánchez-Lavega of the University of the Basque Country combined observations conducted with the Hubble Space Telescope between 2023 and 2025. They observed an evolution of this structure, which was initially only vaguely defined and then took on more defined contours. This decagon has similarities to the hexagon at Saturn’s north pole but also exhibits some differences. The researchers believe it could be generated by a new atmospheric phenomenon.

Artist's concept of the zone called ENDTRANZ, colored in red, part of a forming star system

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An article published in “The Astrophysical Journal” reports the results of a study that has identified an important part of the planetary formation process. A team of researchers led by Indrani Das of the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA) has discovered a transition zone where gas becomes a part of a planet-forming disk using the ALMA radio telescope. This zone was called ENDTRANZ (Envelope Disk Transition Zone) and was located around the protostar L1527 IRS.

A graph with the conservative habitable zone illustrated by the orange band and ellipses illustrating the extended habitable zone proposed by this study

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An article published in “The Astrophysical Journal” reports the results of a study on the habitable zone that goes beyond the so-called conservative zone because it’s based on rigid assumptions. Astrophysicist Amri Wandel of the Hebrew University of Jerusalem focused on examining the conditions existing in systems of low-mass stars: orange dwarfs (K-class stars) and red dwarfs (M-class stars). The study specifically considered planets tidally locked to their stars.

Amri Wandel conducted an analysis using climate models that account for global heat transport, the greenhouse effect, and albedo. This led him to conclude that these stars may host planets potentially habitable for Earth-like life forms orbiting outside the conservative habitable zone.

Artist's concept of the of the exoplanet PSR J2322-2650b and its pulsar (Image NASA, ESA, CSA, Ralf Crawford (STScI))

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An article published in The Astrophysical Journal Letters reports the results of a study of a gas giant exoplanet cataloged as PSR J2322-2650b, which has a completely abnormal atmosphere composed above all of helium and carbon. A team of researchers used observations conducted with the James Webb Space Telescope to study the atmosphere of this exoplanet, which has a mass similar to Jupiter’s and has a distance from its star that is only one-hundredth of the Earth’s distance from the Sun. The star is a pulsar, adding another unusual element to the system. PSR J2322-2650b can’t be explained by current models of planetary formation.

Some views of the rock Cheyava Falls with spectroscopic results (d) from the examination of samples from the area

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An article published in the journal “Nature” reports the results of the analysis of data collected by NASA’s Mars Rover Perseverance on the rock nicknamed Cheyava Falls. Perseverance found it in 2024 in the Neretva Valley during its journey within the Jezero Crater on Mars. The rock immediately attracted great interest because it contains chemical signatures and structures that could have been generated by ancient Martian life forms.

A team of researchers confirmed the exciting results presented last year and concluded that these are potential biosignatures. This means they provide clues to the possible presence of Martian life forms in the past, but further studies are needed to obtain definitive answers. In fact, the presence of organic compounds and iron minerals such as vivianite and greigite could also be due to abiotic reactions.