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#gravity

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Identifying the formation period of planetary systems, such as our solar system, could be the beginning of the journey to discover the origin of life.

The key to this is the unique substructures found in protoplanetary disks—the sites of #planet formation.

A protoplanetary disk is composed of low-temperature molecular gas and dust, surrounding a #protostar.

If a planet exists in the disk, its #gravity will gather or eject materials within the disk, forming characteristic substructures such as rings or spirals. In other words, various disk substructures can be interpreted as "messages" from the forming #planets.

#astronomy #exoplanets
phys.org/news/2025-06-super-re

Niitä elokuvia on todella vähän, joita haluan katsoa useammin kuin kerran. Niitä on vielä vähemmän, joita hauan katsoa yli kaksi kertaa.

Gravity kuuluu niihin harvoihin elokuviin, jotka olen nähnyt useamman kerran ja silti tekisi mieli katsoa se uudelleen. Se on yksi suosikkielokuviani koskaan.

Sen lisäksi, että se on audiovisuaalisesti aivan uskomaton teos, se on myös kiehtova tarina ihmisten kyvystä selviytyä ylitsepääsemättömistä vaikeuksista. Se on tarina ahdistuksesta, masennuksesta ja menetyksestä.

Itselleni elokuvan katseleminen on kokemuksena ahdistava, mutta se on hallittua ahdistusta. Hyvää ahdistusta, jos niin voi sanoa. Pään sisäistä repimistä vahvistaa elokuvan timanttinen äänisuunnittelu ja mahtava musiikki.

Jos et ole nähnyt elokuvaa, suosittelen katsomaan!

Video on pätkä elokuvan avauskohtauksesta, joka kestää katkeamattomana yli 13 minuuttia. Itsellä alkaa pumppu kiihdyttämään tahtia pelkästään tuon katsomisesta 😅

youtube.com/watch?v=D5plJdJZ9Cs

Wide binary #stars with separation greater than about 2000 AU are interesting natural laboratories that allow a direct probe of #gravity at low acceleration weaker than about 1 nanometer per second squared.

Now, astrophysicists have developed a new method of measuring gravity with all three components of the velocities (3D velocities) of stars, as a major improvement over existing statistical methods.

For wide binaries whose stars orbit each other with an internal acceleration greater than about 10 nm/s², the inferred gravity is precisely Newtonian, but for an internal acceleration lower than about 1 nm/s² (or separation greater than about 2000 AU), the inferred gravity is about 40% to 50% stronger than Newton.

The significance of the deviation is 4.2-sigma, meaning that standard gravity is outside the 99.997% probability range.

What is striking is that the deviation agrees with the generic prediction of modified gravity theories under the theoretical framework called modified Newtonian dynamics (#MOND), sometimes referred to as Milgromian dynamics.

#astronomy #cosmology
phys.org/news/2025-05-3d-veloc

Phys.org · 3D velocity analysis of wide binaries supports modified gravity at low accelerationBy Sejong University

Gravity is one of the basic forces of nature that keeps the universe stitched together. Right? But, writes Melvin Vopson, suppose the law of gravity “is simply an echo of something more fundamental: a byproduct of the universe operating under a computer-like code.” It’s a scary thought, but the associate professor of physics explores it in this article for @TheConversationUS:

flip.it/FctFqk

The ConversationCould gravity be evidence that the universe is a computer simulation? My new study suggests why this might be so
More from The Conversation UK