Monica Grady is a Professor of Planetary and Space Sciences, The Open University
Monica Grady is a Professor of Planetary and Space Sciences, The Open University
“In space, no one can hear you scream” was the tagline of the 1979 box office film success Alien. And it’s true. Sound waves propagate mechanically as a vibration and therefore need a medium — solid, liquid or gas — to travel through. Although interplanetary (and interstellar) space is not completely empty, gas molecules and dust grains […]