Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...
An artist's rendition of a collision between two planetesimals in the debris disk around a young star.Thomas Müller Scientists have captured the first direct images of colliding objects in a ...
The Air Force refueling tanker was flying without its location transponder activated and could not be detected by air traffic control. By Riley Mellen The pilot of a JetBlue flight reported on Friday ...
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