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" ... About an hour after the launch, the Starlink satellites will be deployed at an altitude of 440 kilometers, with their altitude later being raised to 550 kilometers with their onboard ion thrusters powered by krypton. It’s unclear how long they will remain in orbit, or how they will operate, although SpaceX did release some limited information prior to the launch. ... "
" ... Measuring the frequency of the radio signal allows the scientists to measure the energy of the electron. The team has so far gotten precise measurements using krypton gas – so precise, that they’re encouraged to move onto trying tritium gas next. ... "
" ... Today, most countries use a version of the metric system called the International System of Units, or SI. Many of the original units have seen some slight revisions over the years – a meter is still recognizable as a meter, but in 1960 scientists redefined it based on a number of wavelengths of an isotope of krypton (so much for simplicity), and in 1983, it became the distance light travels in 1/299,792,458th of a second. It’s the same distance by any of these definitions. ... "