A decade after the first detection of gravitational waves from merging black holes, the field of multimessenger astrophysics has become increasingly rich and complex. With a growing number of detected GW events, these sources are now contributing to resolving the H₀ discrepancy and may offer insights into new physics beyond the standard Lambda Cold Dark Matter (ΛCDM) cosmological model. Meanwhile, recent results from extremely high-energy neutrinos detected by IceCube and KM3NeT are shedding light on the environments and populations of their distant cosmic sources. Now that the Rubin Observatory is online and the Legacy Survey of Space and Time (LSST) has begun, the potential for optical follow-ups of both GW and neutrino signals has greatly increased—sharpening our view of the multimessenger and transient sky as never before.
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