Gravity

Category archives for Gravity

“We detect motion along this axis, but right now our data cannot state as strongly as we’d like whether the clusters are coming or going.” -Alexander Kashlinsky When dark energy was discovered, and the expansion of the Universe was shown to be accelerating, there was concurrently another puzzle that received much less attention: the problem…

“How well I have learned that there is no fence to sit on between heaven and hell. There is a deep, wide gulf, a chasm, and in that chasm is no place for any man.” -Johnny Cash The largest mountains, the greatest chasms, steepest cliffs and the tallest peaks on Earth are certainly impressive, particularly…

“You can be the Moon and still be jealous of the stars.” -Gary Allen Earlier this week, NASA announced the discovery of Asteroid 2016 HO3, calling it Earth’s second moon. And it turns out that this is an object in a stable orbit, the same distance from the Sun as the Earth, that can be…

“We shall not cease from exploration, and the end of all our exploring will be to arrive where we started and know the place for the first time.” -T.S. Eliot Now that not just one but two gravitational wave events have been directly detected, we’re officially in the era of true gravitational wave astronomy. LIGO…

“It turned out that nature was very kind, and there appear to be many of these black holes in the Universe and we were lucky enough to see one.” -Dave Reitze, executive director of LIGO On September 14th, 2015, just days after turning on, the twin Advanced LIGO detectors detected the first gravitational wave signature:…

“The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is.” -Richard Feynman One of the strangest, most novel predictions of Einstein’s relativity is that mass would not only curve space, but…

“To explain all nature is too difficult a task for any one man or even for any one age. ‘Tis much better to do a little with certainty & leave the rest for others that come after you.” -Isaac Newton Perhaps the greatest, most successful scientific theory of the past century is Einstein’s General Relativity,…

“Even if I stumble on to the absolute truth of any aspect of the universe, I will not realise my luck and instead will spend my life trying to find flaws in this understanding – such is the role of a scientist.” -Brian Schmidt Imagine you had arbitrarily great technology, limitless energy, and the ability…

“The fact that gravitational damping is measured at all is a strong indication that the propagation speed of gravity is not infinite.  If the calculational framework of general relativity is accepted, the damping can be used to calculate the speed, and the actual measurement confirms that the speed of gravity is equal to the speed…

“The world is the great gymnasium where we come to make ourselves strong.” -Swami Vivekananda But what does it truly mean to be strong? We have four fundamental forces in the Universe: the strong, electromagnetic, weak and gravitational forces. You might think that, by virtue of its name, the strong force is the strongest one.…