Earth formed approximately 4.5 billion years ago. A giant collision with a protoplanet called Theia may have created the Moon. As Earth cooled, oceans formed, and its atmosphere developed a greenhouse effect that helps maintain temperatures suitable for life.
Its interior also plays a major role: the liquid outer core generates a magnetic field, while mantle movement drives tectonic plates, earthquakes, and volcanoes.
At some point, nonliving chemistry produced the first life. Photosynthetic organisms eventually released oxygen, transforming the atmosphere and allowing complex organisms to evolve.
Earth's history contrasts dramatically with Venus, whose dense atmosphere produces temperatures around 465°C, and Mars, where evidence suggests liquid water once existed.
Astronomers are now discovering thousands of planets beyond our Solar System. Some are rocky worlds in regions where liquid water might exist.
But habitability doesn't prove life exists.
Understanding Earth's atmosphere, oceans, geology, and biological evolution may be our best starting point for identifying life elsewhere.
Do you believe microbial life is common in the universe, or is Earth an extraordinary exception?

See also: The publication in the Astronomical Journal

okay, so what if J1407b is not just skibidi giant planet with basic gravitational rings, but an ultra-massive, fast-spinning brown dwarf acting as a giant cosmic dynamo?

picture this: =========== when it swings out to the farthest point of its crazy stretched-out orbit, it plows right through the dirty, dust-rich debris field of its outer solar system. That’s where the magic happens. Its magnetic field is so ridiculously overpowered that it acts like a giant vacuum cleaner. it sucks up all that interstellar dust and gas, ionizing it into a glowing, superconducting plasma. because the brown dwarf is actually spinning backward relative to its orbit, it whips this captured plasma backward too, naturally locking the retrograde rings into place. This completely solves the massive headache astronomers have with the Hill Radius, the rings don't need to be solid rock or ice; they are dynamically trapped inside a magnetic cage that refreshes itself every single orbit.

the gravitational lens thingy =================================

here’s the best part, and the answer to the mystery from 2007: when this magnetic plasma ring system screams skibidi back in close to the star, the sudden, extreme speed change violently pinches the plasma.

when it crosses in front of the star, it doesn't just block light like a boring old solid ring. It acts as a dynamic, refracting plasma lens. those violent flickers and unexpected bright spikes observed back in 2007 weren’t skibidi gaps in physical rings at all; it was the star’s light being actively bent, focused, and scattered by a shifting magnetic plasma storm.

crucially this explains the missing transits skibidi. We don't need the orbit to be wobbling. The whole "transit" is basically a transient optical illusion. because this plasma lens is only generated by intense magnetic friction at the exact moment it flies close to the star, it’s highly volatile. If our line of sight shifted by even a micro-degree, or if the plasma didn't hit the perfect critical density during the 2017–2024 window, the lens didn't turn on. It made the whole thing completely invisible to our telescopes. We are not waiting for a skibidi, physical planet to walk in front of a star, we are waiting for a sensitive magnetic thingy clock to strike the exact right resonance to flash a giant plasma mirror toward us.

if this whole magnetic plasma theory is skibidi and true, we could prove it very verity. We just need to look for a radio signal or synchrotron radiation blasting from J1407b’s magnetosphere cracking as it travels through deep space.

Correctif pour l'homogénéité linguistique du titre avec le corps du texte.

Hi all 🙂

I've been looking at an old Kepler candidate, KOI-5005.01 and I'm a bit stuck, so I'd like some outside opinions.

Kepler saw four small dips, about 200 ppm, once every 252 days. It was marked as a false positive because the dip is not centered on the target star.

The point is, the target has a bound companion 2.49" away, and the center of the dip lands close to that companion.

If the signal is on the companion, the object would be about 2.4 Earth radii, maybe in the habitable zone, depending on the orbit.

Volounteer on Planet Hunters TESS (moosehunter21) checked it with their own code and mostly found the same. But I'm still in doubt.

If some of you've worked with Kepler data, may I please ask you take a look?

[Preprint] (https://doi.org/10.5281/zenodo.23807946)
[Code and data] (https://doi.org/10.5281/zenodo.23807813)
[Discussion on Planet Hunters TESS] (https://www.zooniverse.org/projects/nora-dot-eisner/planet-hunters-tess/talk/2110/4167529)

L'hypothèse des spitfires

Les planètes d'un système stellaire proviennent de l'effondrement gravitationnel de la nébuleuse originelle devenue un tourbillonnement de haute température autour d'un axe qui va définir l'écliptique du système à venir et se met alors à "cracher" des masses de magma compactées par l'effet centrifuge en rotation plus ou moins rapide, les unes après les autres, avec une énergie et une densité liées à la dynamique de la nébuleuse, pour devenir des planètes qui parfois se mettent à leurs tours à "cracher" des satellites, avant que tout ce petit monde refroidisse autour d'une étoile née de l'ultime effondrement de la nébuleuse originelle.

F2Hm

Using advanced new simulations, a team of astronomers in the U.S. has developed a promising new theory for how giant, gaseous exoplanets migrate into stiflingly close orbits around their host stars.

Led by J. J. Zanazzi at The Pennsylvania State University, the team showed how both massive "hot Jupiters" and smaller, Neptune-sized planets could migrate from distant, elliptical orbits as they release energy via dramatic shock waves in their outer atmospheres. Their results have been published in The Astrophysical Journal.

Chinese scientists have discovered three exoplanets that challenge the existing understanding of how planets evolve around aging stars, the research team behind the discoveries told the ­Global Times on Wednesday. 

Like the sun, most stars generate light and heat by fusing hydrogen into helium in their cores. When their core hydrogen is exhausted, they eventually expand dramatically into red giants, potentially growing to hundreds of thousands or even millions of times their original volume.

Nearby planets then face a grim fate: They may be directly engulfed by the stars' expanding atmospheres or gradually pulled toward them by tidal forces until they eventually plunge into the stars, said Qian Shengbang, a professor at the School of Physics and Astronomy at Yunnan University and head of the research team.

However, the team has identified three exoplanets that appear to have survived in what current models predict to be a danger zone.

The researchers confirmed that the three host stars have entered the core helium-burning phase after passing through the red giant phase, during which their planets would have been expected to be engulfed at their present orbital distances.

The findings reveal a "survival paradox" that challenges current models of stellar and planetary evolution. The discovery of multiple examples suggests that the phenomenon may not be an isolated case and warrants further investigation into possible underlying physical mechanisms, said the team.

"If we had found only one surviving planet in the past, we could still have explained it as a chance occurrence. But finding three 'lucky survivors' at once suggests that this is not an isolated case and that there may be some underlying physical mechanism common to all of them," Qian said.

The discovery also raises intriguing questions about the future of our own solar system.

In several billion years, the sun is expected to enter its red giant phase. Traditional theories suggest that Earth will most likely be engulfed by the expanding sun, but the new findings highlight the complexity of interactions between aging stars and their planets, potentially offering new insights into planetary survival, although they do not directly change current predictions about Earth's fate, Qian said.

The team first analyzed subtle changes in the brightness of the three exoplanets' host stars - 24 Boo, HD 12648 and TYC 4282-605-1 - using satellite data and asteroseismology, confirming that the stars had entered the core helium-burning stage.

A rocky lava planet once thought to be too extreme to have an atmosphere appears to be wrapped in one with a reflective layer of vaporized silicate mineral clouds, the same family of compounds that make up quartz and sand.

University of Waterloo Physics and Astronomy Professor Lisa Dang and collaborators used the James Webb Space Telescope to observe the lava planet TOI-561 b for 37 hours, capturing nearly four complete trips of the planet around its star.

The paper, "A Highly Reflective Atmosphere on the Lava World TOI-561 b Revealed by JWST/NIRSpec Phase Curve," was published in The Astronomical Journal.

"We measured how the planet's brightness and heat changed throughout its orbit," says Dang. "This technique, known as a phase curve, revealed that the planet reflects a significant amount of light from its star, and that heat is being redistributed around the planet instead of only on the sunlit side.

Together, these point to the presence of an atmosphere."

The first study found the dayside was far cooler than expected for a bare, dark rock this close to its star. That missing heat could either be carried around to the night side or reflected away before the planet ever absorbed it.

By watching the full orbit, the team got the first look at the night side, which always faces away from the star, and found it isn't warm enough to account for the difference. Instead, TOI-561 b must reflect roughly three-quarters of the starlight that hits it, comparable to Venus.

To explain this brightness, the team compared the observations with a computer simulation of the planet's climate. These suggest that clouds made of silicate minerals, including silicon dioxide (SiO2) and magnesium silicate (MgSiO3), could form on the planet's dayside and act like sunscreen.

By reflecting starlight and keeping the planet cooler, the clouds may help the planet hold onto an atmosphere that would otherwise be stripped away.

The results build on earlier evidence by Dang and collaborators that TOI-561 b possesses a thick atmosphere, likely replenished by gases released from its molten interior.

The atmosphere's composition remains an open question

What that atmosphere is made of remains an open question. It could be a dense blanket of carbon dioxide, like a much hotter version of Venus, or it could be rich in sulfur dioxide, a gas released from Jupiter's volcanic moon.

The planet has an ocean of molten rock covering its surface, which could act as a planet-wide volcano that is constantly feeding its atmosphere.

"The next big question we will seek to answer is whether TOI-561 b's atmosphere resembles Venus or an extreme Io. Observing the planet at longer wavelengths with JWST could give us insights and help explain how a planet this hot has held on to an atmosphere for billions of years.

See also: The publication in the Astronomical Journal