Gravity
10 articles-
Evolution’s Gravity: A Paean to Natural Selection
Physicists speak of four fundamental forces that govern the interactions among the bits of matter that make up our universe. The strongest of these four forces, aptly known as the Strong Force, is so powerful that it can keep an atom’s positively charged protons from ripping the atom’s nucleus apart as their mutually repellent positive […] -
Science Is Finally Getting Its Close-up
In case you hadn’t noticed, science is enjoying a renaissance on screen. Not science fiction—that’s always been a silver screen staple—but actual scientists doing actual science. As Nautilus explained in December, in “How We Got from Doc Brown to Walter White,” the fictional scientist, in particular on TV, has evolved from the nutty genius to […] -
Watch Water Levitate, Flow Up, & Swirl the Wrong Way in the Other Hemisphere
The conventional wisdom is all wrong. Countless parents and teachers have gotten it twisted. The BBC and PBS aired bogus explanations. Even textbooks have botched the story. Nautilus Members enjoy an ad-free experience. Log in or Join now . The Earth’s rotation, and the Coriolis effect that results, do not cause water to circle the […] -
Why “Hawking Radiation” Was Almost “Feynman Radiation”
Nautilus’ Ingenious this month, Alan Lightman, is a successful writer and physicist, and one of the very rare people to receive an appointment in both science and humanities at MIT*. He did his doctoral research at Caltech while Richard Feynman was a professor there. One day, Lightman was on hand to see the brilliant and […] -
Why Galactic Collisions Are So Beautiful
The Antennae Galaxies are in a state of “starburst,” when the gas from the two colliding galaxies crashes together to produce huge numbers of new stars.ESA/Hubble & NASA Nautilus Members enjoy an ad-free experience. Log in or Join now . According to the basic approximation, stars are formed by a stately, gradual process that belies […]
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“White Holes” Could Exist—But That Doesn’t Mean They Do
Nautilus Members enjoy an ad-free experience. Log in or Join now . A black hole is a one-way door to oblivion. According to general relativity, once anything crosses its boundary—the event horizon—it cannot return to the outside. For that particle, the black hole is the entire future.We’ll never actually get a chance to see […]
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The Father of Inflation Clears Up a Big Misunderstanding
Last week researchers working on the BICEP2 experiment in Antarctica announced that they’d seen solid evidence of gravitational waves that emerged very early in the Universe’s history. This discovery lent support to inflation, a theory of cosmology long popular among physicists but still lacking in direct proof. (To learn more about the recent discovery and […]
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The Most Massive Object in the Universe—How Was It Created?
Nautilus Members enjoy an ad-free experience. Log in or Join now . The galaxy known prosaically as M87 doesn’t look like much. Unlike beautiful spiral galaxies (including the Milky Way), M87 appears as an orangish blob of stars through telescopes. Its only noticeable feature is the long streamer of gas emanating from the galactic […]
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Where Nature Hides the Darkest Mystery of All
Nautilus Members enjoy an ad-free experience. Log in or Join now . No known object in existence has as clear a division between “inside” and “outside” as a black hole. We live and see the outside, and no probe will bring us information about the inside. We can send radio messages or robotic spacecraft, […]
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Reading the Tea Leaves: How Particles Can Travel Upstream
It’s been said that the true harbinger of scientific discovery is not “Eureka!” but “Huh… that’s funny….” That certainly proved to be the case for Sebastian Bianchi: a simple cup of tea led him to some intriguing, counter-intuitive insights into the surface tension of water. Nautilus Members enjoy an ad-free experience. Log in or Join […]