Radar (acronym for Radio Detection and Ranging) uses radio waves to detect objects in the environment. It allows determining the distance (known as range), angular position (bearing), and velocity.

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Radar systems used by civilian airports and military operations may be unintentionally revealing our planet's existence to potential "extraterrestrial observers." This is the conclusion of a study ...

After 19 Russian drones crossed into Poland, President Volodymyr Zelenskyy offered Warsaw Ukrainian training in what he calls the “hunter-killer” approach.

The Mars Express radar, MARSIS, has now been deployed for more than four months. Here we report on the activities so far. For the operational period up to now, Mars Express has been making its closest ...