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AGelbert

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If You Think Jupiter Orbits the Sun, You're Mistaken
« Reply #120 on: November 01, 2019, 01:33:09 pm »
An artist's depiction of the solar system. ANTAR DAYAL/GETTY IMAGES

If You Think Jupiter Orbits the Sun, You're Mistaken     
BY CHRISTOPHER HASSIOTIS AUG 9, 2016


If we picture the solar system, we often picture our dominant star at the center of things, static and immobile as planets orbit circles around it. That picture makes things simple to understand, but technically it's inaccurate. Take our largest planet Jupiter, for instance. It doesn't orbit the sun's center — it orbits a spot in empty space between it and the sun called the barycenter. This is because the sun doesn't just exert gravity on Jupiter — Jupiter's so big that its own pull affects how the sun moves, too.

The sun is about 1,000 times more massive than Jupiter, and these two bodies affect one another proportionally according to distance and mass, so the amount Jupiter's gravity pulls on the sun is one-thousandth the amount the sun's gravity pulls on Jupiter. And Jupiter's orbit takes 11.8 Earth years to complete, and the sun travels around the barycenter takes the same amount of time.

The Sol-Jupiter barycenter sits 1.07 times the radius of the sun from the sun's center, or 7 percent the radius of the sun from the surface. The sun also orbits this spot; if you were to look at the planetary plane from above, you'd notice a slight wobble as the sun moves around the Milky Way, as this hypnotic NASA animation helps explain.

https://science.howstuffworks.com/jupiter-orbit-sun-barycenter.htm

Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

AGelbert

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Water Vapor Plumes on Europa
110,186 views•Nov 18, 2019


NASA Goddard
615K subscribers

What makes Jupiter's moon Europa so alluring is the possibility that it may possess all the ingredients necessary for life. Scientists have evidence that one of these ingredients, liquid water, is present under the icy surface and may sometimes erupt into space in huge geysers. However, no one has been able to confirm the presence of water in these plumes by direct measurement of the water molecule itself. Now, an international research team led out of NASA's Goddard Space Flight Center in Greenbelt, Maryland has detected the water vapor for the first time above Europa's surface. The team measured the vapor by peering at Europa through one of the world's biggest telescopes in Hawaii. Confirming that water vapor is present above Europa helps scientists better understand the inner workings of the moon.

Science Paper: https://www.nature.com/articles/s4155...

Video Credits:
Produced and Edited by: David Ladd (USRA/NASA's Goddard Space Flight Center)
Animations by: Michael Lentz (USRA/NASA's Conceptual Image Lab), and NASA's Jet Propulsion Laboratory
Lead Scientist: Lucas Paganini

Music provided by Killer Tracks: "Cross the Line" - Wally Gagel & Xandy Barry

Keck Observatory visuals provided by: Sean Goebel/W. M. Keck Observatory

This video is public domain and along with other supporting visualizations can be downloaded from the Scientific Visualization Studio at: http://svs.gsfc.nasa.gov/13163

Credit: NASA's Goddard Space Flight Center/David Ladd

If you liked this video, subscribe to the NASA Goddard YouTube channel: http://www.youtube.com/NASAExplorer

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Category Science & Technology
Hope deferred maketh the heart sick: but when the desire cometh, it is a tree of life. Pr. 13:12

 

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