8legs: Physics

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#1 out of 318.0K est. views

17h ago

JWST captured the first cosmic question mark in 2023, near the star-forming region Herbig-Haro 46/47.
A second question mark appeared in 2024 due to gravitational lensing by the massive cluster MACS-J0417.5-1154.
NASA explains the lensing pattern shows two distant galaxies forming a question-mark shape as part of an early interaction.
The 2023 and 2024 findings help scientists understand how galaxies grow through mergers over cosmic time.
NASA notes that the question-mark shapes arise from distant, not nearby, objects in infrared imaging.
The article notes the initial focus was on star formation, not the question-mark shape.
The 2023 image highlighted Herbig-Haro 46/47 as the main point of interest near the question mark.
Astronomers describe the 2024 lensing case as beginning of an interaction between galaxies.
The article emphasizes that gravitational lensing can produce multiple images of distant objects.

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#2 out of 3

9h ago

The Moon is moving away from Earth at about 3.8 centimeters per year due to tidal forces between the two bodies.
Laser ranging measures the Moon’s distance by bouncing light off mirrors placed on the Moon by astronauts and probes.
As the Earth spins, tidal bulges lead the Moon slightly, pulling it forward and increasing its orbit.
The Moon’s increasing distance causes Earth’s rotation to slow slightly, lengthening the day over time.
In the far future, the Earth and Moon may become tidally locked, stopping the Moon’s gradual drift.
The Sun’s evolution will eventually halt large tidal effects by boiling away Earth's oceans.
Despite the drift, daily life and events like eclipses will continue for millions of years.
Historical context shows the Moon formed about 4.5 billion years ago and was closer to Earth then.
Fossil evidence suggests Earth’s day length has increased from about 23.5 hours around 70 million years ago.
The Moon’s distance fluctuates within a month due to its elliptical orbit.
Future astronomy will continue to monitor Earth–Moon dynamics as part of ongoing science outreach.

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#3 out of 3

Researchers demonstrated room-temperature optically addressable spins in hexagonal boron nitride emitters.
Single-step thermal processing yields high-density, narrowband quantum emitters in hBN.
The work links spin-active defects to potential spin–photon interfaces in layered materials.
Spectral and ODMR measurements map emitter wavelength, density, and spin activity.
The study discusses oxygen-annealed emitters showing room-temperature behavior.
Theoretical and computational work supported the defect mechanisms involved.
The article provides supplementary data detailing spin dynamics and defect classes.
Emphasis on room-temperature spin read-out enables practical quantum sensing.
The work expands the material platforms for quantum technologies beyond diamonds.
The research affiliations span multiple universities, including Australia and Hungary.

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