Skip More from 5 Live... The 5 Live at 30 Yearbook How 5 Live reported on some of the biggest news and sport stories of the past 30 years. What Elis James and John Robins got up to in 2024 It’s ...

Most radars can measure reflectivity but you need a Doppler radar to measure velocity. Some 40 years earlier in 1842 the Austrian physicist Christian Doppler had discovered what is now called the ...

Copyright © 2024 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking.