||
Are you smart enough to understand Brian …
Are you smart enough to understand this …
Lifestyle
Are you smart enough to understand this physicist explain string theory?
Renowned theoretical physicist, Brian Greene, explains string theory as if he's talking to a graduate student of physics and then he boils it down for the rest of us. Greene is the co-founder of the World Science Festival, which has a new initiative called "City of Science" which is a 5-event series taking place this fall. "City of Science" is free and open to all New Yorkers of all ages. Learn more about where and when it will take place here. You can also follow the events on Facebook, Twitter, and Instagram. Follow TI: On Facebook
Business Insider
Science
How to iron out gravity’s creases in our map of the universe
HOW do you iron out the folds in a universe? Our most precise map of the big bang’s afterglow - the cosmic microwave background (CMB) - is flawed, distorted by the gravity of giant galaxies warping the fabric of space-time. Like creases in a map that obscure part of a coastline or a continent, the distortions hide details about the primordial universe. Now, Patricia Larsen at the University of Cambridge and her colleagues have a way to smooth out the map. The group is using the warmth emitted by dust in distant galaxies - the cosmic infrared background - to reverse the distortion. Other teams are already trying this “de-lensing” method to remove the effect of gravity from telescope data, to better
New Scientist
Science
Gravitational Waves May Permanently Alter Spacetime - NOVA Next
For decades, physicists searched in vain for evidence of gravitational waves, the stretches and squeezes in spacetime that were first predicted by Albert Einstein’s theory of general relativity a century ago. Now that gravitational-wave detection is likely becoming a regular occurrence-we’ll probably find evidence of many more in the next few years-physicists are again pondering an obscure detail about gravitational waves that was once also thought virtually impossible to observe-gravitational-wave memory, which involves permanent changes in the distance between two objects. An artist's impression of GW150914, the event that created the first observed gravitational waves. “For so many years, people were simply concentrating on making that first detection of gravitational waves,” says Paul Lasky, and astrophysicist at Monash University in Australia.
NOVA Next
Science
The Universe Contains 20 Times More Galaxies Than We Thought
A new study from a team of international astronomers, led by astrophysicists from the University of Nottingham with support from the Royal Astronomical Society (RAS), has produced some astounding results: The universe contains at least two trillion galaxies, 20 times as many as previously thought. What's more, the new study suggests that 90 percent of all galaxies are hidden from us, and only the remaining 10 percent can be seen at all, even with our most powerful telescopes. "We are missing the vast majority of galaxies because they are very faint and far away," said Nottingham Astrophysics Professor Christopher Conselice in an RAS press release. "The number of galaxies in the universe is a fundamental question in astronomy, and it boggles the mind that over 90 percent of the galaxies in the cosmos have yet to be studied.
Popular Mechanics
Lifestyle
How Can Complex Things Form in a Universe Ruled by Entropy?
Recently, when we were talking about why time only moves forward, we got into talking about the Second Law of Thermodynamics. It says that disorder, otherwise known as entropy, must always increase. For instance, if you add cream to your coffee, you'll always get an even mix of the two. This is the most disordered state. And because entropy can never decrease, your coffee can never spontaneously unmix itself. If that's true, and the universe is constantly getting more disordered, then why do we see ordered things like galaxies and planets and people? Surely if the universe always gets more disordered, we shouldn't expect complex things like ourselves to form. Well, over at MinutePhysics, physicist
Popular Mechanics
Astronomers may now fully understand why the sky is dark at night
Science
Before the Big Bang there was another universe and a new one will emerge after ours collapses
Archiver|手机版|科学网 ( 京ICP备07017567号-12 )
GMT+8, 2024-11-27 02:46
Powered by ScienceNet.cn
Copyright © 2007- 中国科学报社