From rovers on the surface of Mars to Voyager 1 near the edge of the solar system, spacecraft regularly call home to Earth. For five decades, the Deep Space Network has been at the other end of the line.
The belt emerges as a fundamental climatic feature of atmospheric circulation patterns on a rotating and differentially heated planet. But locating its edges and discerning anthropogenic influences remain difficult research problems.
The discomforts of noise in working and living can be reduced only by a rational approach to acoustics problems when building houses and factories, writes the technical director of the Acoustics Laboratory at the Massachusetts Institute of Technology.