EDDINGTON LIMIT
The strange 2% rule: Why black holes suddenly switch on their powerful jets
A new study reveals black holes become predictable when feeding. Jets emerge when accretion rates fall to two percent of the Eddington limit. This threshold applies to black holes of vastly different sizes. Tidal disruption events offer a rare view of this process. Future observations may predict when these powerful jets will appear.
Quote of the day by Albert Einstein: 'Everything is determined, every beginning and ending, by forces over which we have no control...' - Why the concept of free will might be an illusion explained by the genius scientis
Albert Einstein’s quote about an “invisible piper” offers a thought-provoking view of fate, free will and the forces that shape life beyond human control. The quote, shared during a 1929 interview, reflects Einstein’s belief in determinism and comes from a period when his own scientific career and growing fame were changing rapidly.
From ancient rock carvings to Einstein: How eclipses changed human history
Ancient civilizations meticulously recorded eclipses through carvings and writings, capturing the mysterious vanishing act of the Sun. Chinese historians cataloged these celestial phenomena, paving the way for advancements in understanding Earth's rotation. Religious texts intertwined eclipses with pivotal historical and spiritual moments. The Maya, masters of astronomy, incorporated precise eclipse predictions into their calendars.
Quote of the day by Newton, “If I have seen further, it is by standing on the shoulders of giants.” How Einstein demolished Newton’s gravitational theory and introduced the spacetime concept
Quote of the day by Newton: 1915 changed physics forever. In that year, Albert Einstein published the general theory of relativity and reshaped our understanding of gravity and spacetime. For 228 years, scientists relied on Isaac Newton and his law of universal gravitation from 1687. Newton said gravity is a force between masses. Einstein proved gravity is the curvature of spacetime caused by mass and energy. His equations solved the Mercury orbit anomaly of 43 arcseconds per century and predicted gravitational waves and black holes. Today, GPS satellites and modern cosmology depend on Einstein’s spacetime physics. In truth, Einstein did not erase Newton. He stood on Newton’s shoulders—and saw deeper into the universe.
Black hole devouring star for a decade detected
Washington, Feb 7 (IANS) Astronomers have detected a giant black hole that ripped apart a star and then gorged on its remains for an unusually long time -- about a decade, which is more than ten times longer than any observed episode of a stars death by black hole.
