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  • richardmitnick 10:21 am on November 6, 2017 Permalink | Reply
    Tags: , , , Kew Gardens Millennium Seed Bank, Newton’s apple seeds, Sir Isaac Newton, The apple tree in Isaac Newton’s mother’s orchard where Newton saw the famous apple fall, The next step will be to find suitable welcoming homes for the young trees so that they can help tell the intertwining stories of Newton seed science and space travel, The tree is still flourishing at Woolsthorpe Manor Newton’s home near Grantham 330 years after he wrote his great work Philosophiae Naturalis Principia Mathematica,   

    From UK Space Agency Blog: “Newton’s apple seeds” 

    UK Space Agency

    UK Space Agency Blog

    6 November 2017
    Steven Watson

    I’ve just met some remarkable seedlings at Wakehurst Place in West Sussex, where Kew Gardens keeps its Millennium Seed Bank. They are the experts when it comes to anything to do with storing and growing plant seeds.

    The seeds in question were flown on the International Space Station with Tim Peake and were collected from the apple tree in Isaac Newton’s mother’s orchard where Newton saw the famous apple fall, which helped him figure out the laws of gravity. Isaac Newton (born in 1643) was a physicist and mathematician who developed the principles of modern physics including the laws of gravity and motion.

    The tree is still flourishing at Woolsthorpe Manor, Newton’s home near Grantham, 330 years after he wrote his great work Philosophiae Naturalis Principia Mathematica, which set out the laws of gravitation on which every space mission depends. This was the great work that Tim Peake’s Principia mission was named after.

    1
    Newton’s apple tree – and the seeds being presented by Dallas Campbell and Jannette Warrener to the Agency’s Head of Education and Skills, Jeremy Curtis.

    The National Trust’s Operations Manager at Woolsthorpe Manor, Jannette Warrener, and her team harvested the seeds and presented them to the UK Space Agency during Grantham’s annual Gravity Fields festival in October 2014. We then delivered them to Wakehurst Place to dry and pack them for their epic journey into space.

    The seeds were delivered to space in SpaceX-8, a cargo supply to the International Space Station, on the 16 April 2016 and spent 198 days in space before returning to Earth with SpaceX-9 on 26 August 2016.

    2
    Tim with seeds on ISS. No image credit.

    On their return from space, the well-travelled seeds then went back to Wakehurst Place where they spent 90 days sitting on a bed of agar jelly at 5°C to simulate the winter cold needed to break dormancy. Spring arrived for them in May 2017 when they were warmed to 15°C and the young seedlings started to emerge.

    Since then they have grown fast and we now have ten healthy young plants. The Kew staff, led by Hugh Pritchard (Head of Comparative Seed Biology) and Anne Visscher (Career Development Fellow), will continue to nurture them until they are large enough to fend for themselves.

    3
    The healthy young apple trees with the Kew team. From left to right: Jannette Warrener, Joanna Walmisley, Jeremy Curtis, Eliana Van Der Schraft, Anne Visscher, Cristina Blandino, David Cleeve, Hugh Pritchard.

    The next step will be to find suitable welcoming homes for the young trees so that they can help tell the intertwining stories of Newton, seed science and space travel. Watch this space for details of how to make your bid to host one of these precious plants.

    See the full article here .

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  • richardmitnick 4:15 pm on July 8, 2017 Permalink | Reply
    Tags: , , , , , E=MC2 wins, , , , Sir Arthur Eddington, Sir Isaac Newton   

    Brought Foward by Larry Zamick, Rutgers Physics: From Ethan Siegel: “The Last 100 Years: 1919, Einstein and Eddington” 

    Ethan Siegel
    June 11, 2009 [Lary has been at this longer than I.]

    100 years ago, the way we viewed our Universe was vastly different than the way we view it now. The night sky, with stars, planets, comets, asteroids, nebulae, and the Milky Way, was viewed to make up the entire contents of the Universe.

    1
    The Universe was static, governed by two laws only: Newton’s Gravity and Maxwell’s Electromagnetism. There were the first hints that the Universe was made up of quantum particles, such as the photoelectric effect, Rutherford’s first hints at the existence of the nucleus, and Planck’s view that energy was quantized. But other than that — and Einstein’s new Theory of Special Relativity, there were very few mysteries about the Universe in 1909. But one of them would change our view of the Universe forever.

    2
    You see, there was a tiny, tiny problem with the planet Mercury. Its orbit just wasn’t quite right. Kepler’s Laws (which can be derived from Newton’s Gravity) said that all the planets should move in ellipses around the Sun. But Mercury (above) doesn’t quite do that. Mercury makes an ellipse that precesses — or rotates — ever so slightly. Specifically, it precessed at a rate of 1.555 degrees per century. A greatly exaggerated example of precession is shown below:

    3
    Now, physicists and astronomers have always been very detail-oriented people. So they calculated what the effects of the Earth’s equinoxes precessing were, and were able to account for 1.396 of those degrees. They realized that there were seven other major planets (and the asteroids) acting on Mercury, and that was able to account for another 0.148 degrees. That left them with only 0.011 degrees per century that was different between their theoretical predictions and their observations. But this minuscule difference was significant enough that it led some to consider that Newton’s Law of Universal Gravitation might be wrong.

    4
    Newton said that mass and separation distance was what determined gravity. There was a force that he called “action at a distance” that made everything attract. But during the time from 1909-1916, a new theory came about.

    5
    The same guy who discovered the photoelectric effect, special relativity, and E=mc^2 came up with a new theory of gravity. Instead of an “action at a distance” due to mass, this new theory said that space gets bent by energy, and causes everything — even massless things — to bend beneath what we see as gravity.

    6
    Now this new theory was very interesting for a few reasons. First off, it accounted for those 0.011 degrees that Newton’s Gravity did not. Second, it predicted — as a simple solution — the existence of black holes. And third, it predicted that something very exciting and testable would happen: that light would be bent by gravity.

    7
    Big deal, said Newton’s advocates. If I take E=mc^2, and I know that light has energy, I can just substitute E/c^2 for mass in Newton’s equations, and get a prediction that Newton’s gravity would bend light, too. It just so happened that Einstein’s bending was predicted to be twice as much as Newton’s bending, and that there was a total Solar Eclipse coming up in 1919. The stage was set for the most dramatic test of gravity ever.

    8
    The director of Cambridge Observatory, Sir Arthur Eddington, led an expedition to observe the total solar eclipse of May 29, 1919. During an eclipse, the sky gets dark enough that you can see stars, even close to the Sun. So Eddington set out to map the position of the stars when they were close to the Sun, and see how the Sun bent the light. Would it match up with Einstein’s prediction, Newton’s prediction, or would it not bend at all?

    9
    Image credit: American Institute of Physics.

    Lo and behold, Einstein’s prediction was spot on. Just like that, Newton’s theory of Universal Gravitation, the most solid foundation in all of physics — unchallenged for over 200 years — was obsolete. All of this was done in the years 1909-1919, and it was just the start of changing how we view the Universe.

    And (FYI) so far, in the 90 years since, every single prediction of Einstein’s gravity that’s ever been tested — from gravitational lensing to binary pulsar decay to time dilation in a gravitational field — have confirmed General Relativity as the most successful physical theory of all-time.

    See the full article here .

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    • Jose 3:08 pm on September 20, 2017 Permalink | Reply

      Gravity is a little big bigger than in Newton’s law; it increases with speed -kinetic energy- where the maximum is the double gravity in the case of light.
      Global Physics also predicts the anomalous precession of Mercury’s orbit as Paul Gerber did 20 years before Einstein. https://molwick.com/en/gravitation/077-mercury-orbit.html

      Like

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