Einstein Relatively Easy

According to Scientific American, the astronomers of the Event Horizon Telescope have scheduled their first full-on attempt to image the black hole at the center of the Milky Way for next spring

In April 2017, eight observatories around the world—including the Atacama Large Millimeter Array (ALMA) and the South Pole Telescope—will simultaneously observe Sagittarius A* , the supermassive black hole at the center of Milky Way.

A interesting course introducing into General Theory of Relativity has started on Coursera.

Commitment: 12 weeks of study, 4-6 hours per week

More information there Introduction into General Theory of Relativity

I have recenly registered to a physics forum website https://www.physicsforums.com/, where i was paying  special interest to Special and General Relativity category.

A few days ago, there was a discussion about the interval transformations under Lorentz transformations.

Some contributors/moderators there don't seem to believe that the space and time coordinate differences Δx or Δt do transform under Lorentz transformations (which is obvious due to the linearity of the transformation) or that these intervals could even  be used to demonstrate the length contraction or time dilation phenomena, simply showing that they don't understand even the basis and real signification of the Lorentz transformation!

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"The essence of my theory is precisely that no independent properties are attributed to space on its own. It can be put jokingly this way. If I allow all things to vanish from the world, then following Newton, the Galilean inertial space remains; following my interpretation, however, nothing remains.."
Letter from A.Einstein to Karl Schwarzschild - Berlin, 9 January 1916

"Quantum mechanics is certainly imposing. But an inner voice tells me that it is not yet the real thing. The theory says a lot, but does not really bring us any closer to the secret of the 'old one'. I, at any rate, am convinced that He is not playing at dice."
Einstein to Max Born, letter 52, 4th december 1926

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