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Tag: Metrology

This image shows an artist’s impression of winds in Jupiter’s stratosphere near the planet’s south pole, with the blue lines representing wind speeds. These lines are superimposed on a real image of Jupiter, taken by the JunoCam imager aboard NASA’s Juno spacecraft. Jupiter’s famous bands of clouds are located in the lower atmosphere, where winds have previously been measured. But tracking winds right above this atmospheric layer, in the stratosphere, is much harder since no clouds exist there. By analysing the aftermath of a comet collision from the 1990s and using the ALMA telescope, in which ESO is a partner, researchers have been able to reveal incredibly powerful stratospheric winds, with speeds of up to 1450 kilometres an hour, near Jupiter’s poles.

Jupiter’s Supersonic Stratospheric Winds Make it a Unique Beast

Astronomers have measured Jupiter's Stratospheric Winds for the First Time.

A watt balance. And a dude.
Image credits Robert Rathe

What is mass? Baby don’t weigh me – revamping the metrology of mass

byAlexandru Micu

July 27, 2015 - Updated on February 22, 2019

The metric system is due for a mass makeover, as scientists are preparing to redefine four basic units by the ...

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© 2007-2023 ZME Science - Not exactly rocket science. All Rights Reserved.