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December 21st, 2021

Atomic clock. Illustration: shutterstock

What is the national atomic clock and why is it constantly listening to navigation satellites?

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On the occasion of the winter solstice, which began today, Dr. Nadia Goldovski - the person in charge of time and frequency measurements at the National Physics Laboratory at the Ministry of Economy and Industry, explains in an interview to the science website how the time is set in her laboratory using atomic clocks
It is a complex picture of X-rays, molecular gas and hot ionized gas near the center of the galaxy. The orange shapes are glowing hydrogen gas. One of these shapes, at the upper end of the jet (see an illuminated image below) is interpreted as a hydrogen cloud that was hit by the jet and moved outward. The jet disperses the cloud into tendrils that move towards the north. Further down near the black hole are X-ray observations of highly heated gas in blue and molecular gas in green. These data are evidence that the black hole is occasionally accreted by stars or gas clouds, and is ejecting some of the very hot material along its axis of rotation. Credit: NASA, ESA, and Gerald Cecil (UNC-Chapel Hill); Image Processing: Joseph DePasquale (STScI)

The Milky Way's supermassive black hole is still humming long after a burst of powerful 'death rays'

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The Hubble Space Telescope photographed a bright knot of gas hit by an invisible jet from the black hole, which is only 15 light years away. The black hole must have looked bright billions of years ago as a quasar, when our young galaxy was fed by lots of infalling gas. But after all this time the black hole is acting sporadically, unwilling to take a nap
Night flights of the national drone project, 19/12/2021. Photo: Chen Baram, Hartek.

The fourth phase of the national drone project is underway - night flights in the center and in Byruham

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Innovation Authority CEO Dror Bin: "This is another significant milestone in which all partners, both public and private sector, are establishing an innovative model both for drone manufacturers and operators as well as for the Israeli public"
Figure 1. The movement of the Earth around the Sun. Courtesy of Dr. Nadia Goldovski, who is in charge of time and frequency measurements at the National Physics Laboratory at the Ministry of Economy and Industry

Winter 2021 is already here: astronomy also determines

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Dr. Nadia Goldovsky - the person in charge of time and frequency measurements at the National Physics Laboratory at the Ministry of Economy and Industry, explains why astronomical solstices and equinoxes apply and compares the length of the day throughout the year between Tel Aviv and Stockholm
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