Firstly, as the magnetic field does not allow very large molecular clouds to collapse and form stars, star formation can occur only after the clouds break up into smaller clouds. (sciencedaily.com)
This diamond has a very small cloud inclusion that was detected from the top view. (creditdonkey.com)
To measure this frequency, fountain clocks toss small clouds of slow - moving cesium atoms a few feet high, much like a pulsed fountain, and measure their oscillations as they pass up, and then down, through a microwave beam. (sciencedaily.com)