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Radio waves were first predicted by the theory of electromagnetism that was proposed in 1867 by Scottish mathematical physicist James Clerk Maxwell. [6] His mathematical theory, now called Maxwell's equations, predicted that a coupled electric and magnetic field could travel through space as an "electromagnetic wave".
In physics, electromagnetic radiation (EMR) is the set of waves of an electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy. [1] [2] Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields.
Gravitational waves also travel through space. The first observation of gravitational waves was announced on 11 February 2016. [ 32 ] Gravitational waves are disturbances in the curvature of spacetime , predicted by Einstein's theory of general relativity .
It communicates through the NASA Deep Space Network (DSN) to receive routine commands and to transmit data to Earth. Real-time distance and velocity data are provided by NASA and JPL . [ 4 ] At a distance of 166.28 AU (24.9 billion km; 15.5 billion mi) from Earth as of December 2024 [update] , [ 4 ] it is the most distant human-made object from ...
Each little animated gem of history includes a link to its page in the National Archives online database, for more information.
A pulsar emits beams of radio waves that, like lighthouse beams, sweep through the sky as the pulsar rotates. The signal from a pulsar can be detected by radio telescopes as a series of regularly spaced pulses, essentially like the ticks of a clock. GWs affect the time it takes the pulses to travel from the pulsar to a telescope on Earth.
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