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#planet

2 messages2 participants1 message aujourd’hui
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Nonilex

The “endangerment finding” is the #legal underpinning of a host of #climate #regulations under the #CleanAirAct for motor vehicles, power plants & other #pollution sources that are heating the #planet.

#EPA Administrator #LeeZeldin announced the proposed rule change on a podcast ahead of an official announcement set for Tues in Indiana.

Repealing the #endangerment finding “will be the largest deregulatory action in the history of America,” Zeldin said on the Ruthless podcast.

#law#science
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Daniel Fischer

Unveiling a protoplanet candidate embedded in the HD 135344B disk with VLT/ERIS / VLT/ERIS Observations of the V960 Mon System - a Dust-embedded Substellar Object Formed by Gravitational Instability? eso.org/public/archives/releas / iopscience.iop.org/article/10. -> Astronomers witness newborn #planet sculpting the dust around it: eso.org/public/news/eso2513/

The image to the left, taken with ESO’s Very Large Telescope (VLT), shows a possible planet being born around the young star HD 135344B. This star, located around 440 light-years away, is surrounded by a disc of dust and gas with prominent spiral arms. Theory predicts that planets can sculpt spiral arms like these, and the new planet candidate is located at the base of one of the arms, just as expected. The image was captured with a new VLT instrument: the Enhanced Resolution Imager and Spectrograph (ERIS). The central black circle corresponds to a coronagraph –– a device that blocks the light of the star to reveal faint details around it. The white circle indicates the location of the planet. The image to the right is a combination of previous observations taken with the SPHERE instrument also at the VLT (red) and the Atacama Large Millimeter/submillimeter Array (ALMA, orange and blue). These and other previous studies of HD 135344B did not find signatures of a companion, but ERIS may have finally unveiled the culprit responsible for the star’s spiral disc.
Public
Mikko Tuomi

Due to extreme temperatures and the dryness of #Mars, it's thought to be impossible for liquid #water to form on the #planet's surface, a critical precondition for #habitability.

The only hope of finding liquid water appears to be in the form of brines, which are liquids with high concentrations of salts that can freeze at much lower temperatures.

Melting frost presents the best chance to find liquid brines on Mars, but there's a catch: frost on Mars tends to sublimate quickly, which means it transitions from a solid to a gas without spending time in a liquid state due to Mars' unique atmospheric conditions.

However, there appears to be brief window in late winter and early spring when the conditions were right for the formation of brines.

#astrobiology
phys.org/news/2025-07-liquid-b

Phys.org · Study suggests liquid brines could form on Mars' surface during seasonal frost meltingPar University of Arkansas
Public
Daniel Fischer

Orbital Decay of the Ultra-hot Jupiter TOI-2109b - Tidal Constraints and Transit-timing Analysis: iopscience.iop.org/article/10. -> Doomed planet's death spiral could reveal stellar secrets: lighthouse.mq.edu.au/article/j - astronomers led by a team at Macquarie University have tracked an extreme #planet’s orbital decay to understand how stars dissipate energy.

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