A couple of weeks ago, I posted an #animation of a point on a circle generating a #cycloid.
If you turn the curve "upside down", you get the #BrachistochroneCurve. This curve provides the shortest travel time starting from one cusp to any other point on the curve for a ball rolling under uniform #gravity. It is always faster than the straight-line travel time.
Planets directly influence one another, and the more massive they are, the larger their gravitational pull. Mars is a lot smaller than Earth, but new research says it has enough clout to create swirling vortices in our planet's oceans. Atlas Obscura explains: https://flip.it/R.5Vmk #Science#Space#Earth#Mars#Gravity
It’s now thought that they could illuminate fundamental questions in #physics, settle questions about #Einstein’s theories, & even help explain the #universe.
…In recent yrs, the amt of data that scientists have discovered about black holes has grown exponentially.
It’s in these simple, outlandish objects, Broderick explained,“that 20th-cen #physics breaks down.”…Basically, there’s #Einstein’s theory of general #relativity (which made a tiny but far-reaching correction to #Newton’s concept of #gravity), & there’s #QuantumMechanics. “General relativity is thought of as the theory of the very large & massive, & quantum mechanics is the theory of the very small or very cold,” Broderick said. #BlackHoles are massive(gen relativity), & cold (quantum mechanics).
@IRAP#Seminar] this Thursday at 11am. Benjamin Crinquant, a young researcher at IRAP, will present the progress we have made in our knowledge of #BlackHoles: from the observations carried out by the #GRAVITY and #EventHorizonTelescope collaborations to the most recent models of the #magnetospheres and #coronae of black holes.
"Controversial new theory of #gravity rules out need for dark matter.
Paper by UCL professor says ‘wobbly’ space-time could instead explain expansion of universe and galactic rotation.
Dark matter is supposed to account for 85% of the mass in the #universe, according to conventional scientific wisdom. But proponents of a radical new theory of gravity, in which space-time is “wobbly”, say their approach could render the elusive substance obsolete."
Dr. Elisa Maggio is a postdoctoral researcher in the “Astrophysical and Cosmological Relativity” department. She works on tests of gravity in the strong field regime with gravitational-wave observations and on tests of the nature of black holes.
Have you tried taking it off the wall and turning it upside down?
(Whoever designed the Virgin Media access point clearly lived on a planet without gravity. It’s left an unsightly bit of unpainted wall showing for the moment but otherwise should be far more robust now.)