1️⃣ First Exomoon Search via Astrometry
For the first time, astronomers tried to find a moon outside our Solar System using ultra-precise position measurements. The VLTI/GRAVITY instrument tracked the motion of companion HD 206893 B and detected suspicious wobbles consistent with a moon of ~0.4 Jupiter masses. It's only a candidate so far — more observations needed. But the key takeaway: the method works and can detect moons down to Neptune-size. Two more objects — AF Lep b and β Pic b — are next in line.
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2️⃣ Spiral Galaxies "Leaking" Ultraviolet Into Space
For the first time at high redshift (z≈1), harsh ultraviolet radiation was caught escaping from three massive spiral galaxies. Interestingly, all three are oriented face-on toward us — suggesting that viewing angle may determine whether we detect the leak. This matters for understanding reionization — the era when the Universe became transparent to light.
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3️⃣ How Spiral Arms Turn Gas Into Stars
In two classic spirals — NGC 4321 and M51 — researchers traced how gas passes through a spiral arm and gradually compresses until new stars ignite. The deeper into the arm, the more active star formation becomes. This confirms the idea that spiral arms act as waves, squeezing gas and triggering star birth.
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4️⃣ What Happens When White Dwarfs Merge
Simulations mapped all possible outcomes of white dwarf pair mergers in our Galaxy. Depending on masses and composition, the result can be a Type Ia supernova, a magnetar, or an exotic star. Catalogs are publicly available. This becomes especially relevant with the upcoming LISA observatory, which will "hear" tens of thousands of such pairs through gravitational waves.
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5️⃣ Gravitational Waves Tell About the Universe's First Moments
Data from NANOGrav — 15 years of pulsar observations — was used to peer into the inflation era, when the Universe expanded from microscopic to cosmic scales in a fraction of a second. Analysis of background gravitational waves hints that the quantum vacuum of the early Universe may have differed from the standard model — a potential trace of new physics.
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