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A century of sun records reveals clues to its 11-year rhythm

More than a century of observations from India’s historic Kodaikanal Solar Observatory, operated by the Indian Institute of Astrophysics (IIA), Bengaluru, has helped scientists uncover new clues about how the Sun’s surface responds to its 11-year activity cycle. The findings, based on an analysis of 34,000 images collected since 1907, could improve understanding of the processes that drive solar activity and eventually aid efforts to predict changes that affect the space environment around...

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Can You Stop a Hypersonic Missile?

Can You Stop a Hypersonic Missile? The headlines say yes. Patriot crews shot down a Kinzhal over Kyiv on the night of May 4, 2023.

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Optimal Time-Adaptivity for Parabolic Problems

arXiv:2512.05676v2 Announce Type: replace Abstract: Since the first optimality proofs for adaptive mesh refinement algorithms in the early 2000s, the theory of optimal mesh refinement for PDEs was inherently limited to stationary problems. The reason for this is that time-dependent problems usually do not exhibit the necessary coercive structure that is used in optimality proofs to show a certain quasi-orthogonality, which is crucial for the theory. Recently, by using a new equivalence...

arXiv CS 9d ago