Astronomy and Planetary Science Thread

Oxygen production from dissociation of Europa’s water-ice surface

Where will the monks go now?

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Tidal locking is such a common phenomenon in the universe that we only need to look at the Moon to notice it. Our satellite only shows us its near side face as its rotation on its axis and revolution around the Earth are synchronized. Planets too can get in this state of behavior if they orbit their star too closely – and researchers believe they have confirmed the first super-Earth tidally locked to its star.

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A collection of stars 30,000 light-years away is the faintest and lowest-mass Milky Way satellite ever found, according to the group of scientists who recently observed it. Oh, and it may be dominated by dark matter, the unknown stuff that makes up about 27% of the universe.

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The results confirm that the expansion of the universe is speeding up, they added. However, the findings have also raised the tantalising possibility that dark energy – a mysterious, repulsive force that drives the process – is not constant throughout time as has previously been suggested.

Dr Seshadri Nadathur, a co-author of the work and senior research fellow at the University of Portsmouth’s Institute of Cosmology and Gravitation, said: “What we are seeing are some hints that it has actually been changing over time, which is quite exciting because it is not what the standard model of a cosmological constant dark energy would look like.”

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The DESI fly-by POV...high FTL speed by the looks of it...just no relativistic effects.

In space
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Today the LIGO-Virgo-KAGRA Collaboration is proud to announce GW230529, the first exceptional #GravitationalWaves event from our fourth observing run (#O4). You can learn more from
's excellent infographic, or by visiting our detection page!



NASA's Parker Solar Probe makes 1st-of-its-kind observation within a coronal mass ejection

Now, NASA's Parker Solar Probe has gotten a first-ever peek inside a CME as it erupted from the sun. And what lies inside appears to be a treasure trove for solar physicists. The probe's visible-light-detecting, Wide-field Imager for Parker Solar Probe (WISPR) instrument caught clear, turbulent eddies within the CME.

The eddies are what physicists call Kelvin-Helmholtz instabilities (KHI). Physicists think KHI events occur whenever one patch of fast-moving fluid interacts with another. On Earth, KHI occurs in clouds when the wind speed at one end of the cloud is different from that at the other end.

New research from Northwestern University investigates the consequences of these collisions. It uncovers a fascinating phenomenon: stars near the galactic center sometimes merge together or lose mass due to near misses. This dynamic process can lead to surprising changes in stars’ appearances and lifespans.

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Scientists have been left perplexed by unprecedented radio signals coming from a previously dormant star.

The star, known as XTE J1810-197, is a magnetar – a type of neutron star that are also the strongest magnets in the universe. It is the closest magnetar to Earth that we know of, at a relatively close 8,000 light years away.

Now scientists say that it appears to be sending out radio pulses that do not fit with expectations.

”Unlike the radio signals we’ve seen from other magnetars, this one is emitting enormous amounts of rapidly changing circular polarisation. We had never seen anything like this before,” said Marcus Lower, a postdoctoral fellow at Australia’s national science agency, CSIRO, who led the work.

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In October 2022, an international team of researchers, including Northwestern University astrophysicists, observed the brightest gamma-ray burst (GRB) ever recorded, GRB 221009A.

Now, a Northwestern-led team has confirmed that the phenomenon responsible for the historic burst — dubbed the B.O.A.T. (“brightest of all time”) — is the collapse and subsequent explosion of a massive star. The team discovered the explosion, or supernova, using NASA’s James Webb Space Telescope (JWST).

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This here is very unusual
They detected collision of two small object via Gravitational Waves,
One object was small Neutron star with 2 solar mass.
The other is 4 solar mass and also very small.

And here lies the problem
There is mass gab between Neutron stars and Black holes
were this object lies in middle, it's neither a Neutron Star not Black hole !
but what is it then ?

Neutron Hole?

Spinning up the Pointer Sisters right now.

This could be first evidence of Micro Black Hole also called primordial black holes.
Theories goes they were created in the high-density environment of the early Universe.

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