The journey of Earth’s radio signals began over a century ago, following the first intentional broadcast by Reginald Aubrey Fessenden in 1906. These signals have been traveling across the Milky Way ...

Radio silence has long puzzled those searching for extraterrestrial intelligence, but the answer might lie much closer to the source of potential signals than previously thought. Conditions around ...

If advanced aliens lived on a planet within a few hundred to a thousand light years away from Earth, then vast numbers of their signals must already have crossed Earth without being noticed, a new ...

Earth is "contacted" if such a signal passes through our location in space. Detection only happens if the source lies within a range where its signal is strong enough for our telescopes to detect, a ...

Example of hectometric continuum (HMC) radiation recorded by the ERG (Arase) satellite on September 26, 2019. The top panel shows how the intensity of the radio signal varied across the 100–2000 kHz ...