Photographing the deep sky at night can be a complicated business involving specialist knowledge, expensive and bulky ...

Abstract: In this paper, we address a complex motion control problem of fast and precise positioning of the secondary mirror in a large radio telescope, which exhibits strong nonlinear behavior and is ...

Abstract: With the acceleration of urbanization and the increasing complexity of social risks, the construction of efficient and intelligent urban safety emergency response system has become a hotspot ...

New images reveal the Manhattan-sized interstellar object 3I/ATLAS has started to sport a tail, indicating that it could possibly be a “maneuvering” alien craft, one Harvard scientist suggested. After ...