New details on military UFO sightings
&gt; “Or traveling at speeds that exceed the sound barrier without a sonic boom.”<p>Physics noob here so be gentle. I initially thought that the sonic boom is caused by the compression of the sound of the aircraft&#x27;s own engines, but then realised that couldn&#x27;t be correct as meteorites can also create sonic booms and they have no engines.<p>The boom is caused by the air being compressed in front of the object? Is the loudness of the engines irrelevent to the intensity of the boom, it&#x27;s all due to speed?<p>So these sonic boom-less aircraft - if they&#x27;re real - must be doing something to the air in front of it?