From Science News
When it comes to the dimensions of spacetime, what you see may be what you get.
Using observations from the collision of two neutron stars that made headlines in 2017 (SN: 11/11/17, p. 6), scientists found no evidence of gravity leaking into hidden dimensions. The number of observed large spatial dimensions — kilometer-scale or bigger — is still limited to the three we know and love, the researchers report January 24 at arXiv.org.
Just as insects floating on a pond may be unaware of what’s above or below the water’s surface, our 3-D world might be part of a higher-dimensional universe that we can’t directly observe. However, says astrophysicist David Spergel of Princeton University, a coauthor of the new study, “gravity might be able to explore those other dimensions.”
Such extra dimensions might explain some conundrums in physics, such as the existence of dark matter (an as-yet-unidentified source of mass in the universe) and dark energy (which causes the universe’s expansion rate to accelerate), says coauthor Daniel Holz, an astrophysicist at the University of Chicago. “That’s why people get excited about these modifications.”
To look for any hint of leaking gravity, scientists turned to the light and gravitational waves emitted in the neutron star smashup detected on August 17, 2017
From Space Academy
For many years, scientists have been very much baffled by a weird anomaly far away in space: a mysterious “Cold Spot” about 1.8 billion light-years across. It is cooler than its surroundings by around 0.00015 degrees Celsius (0.00027 degrees Fahrenheit), a fact astronomers discovered by measuring background radiation throughout the universe.
Previously, astronomers believed that this space could be cooler simply because it had less matter in it than most sections of space. They dubbed it a massive supervoid and estimated that it had 10,000 galaxies fewer than other comparable sections of space.
Following on from his appearance in Dan Brown’s latest novel ‘Origin’, Jeremy English publishes more research on his hypothesis that ‘life’ is a natural consequence of the laws of physics. Original post via The Space Academy.
A few years back, a remarkable new hypothesis made its way into the scientific zeitgeist – namely, that life is an inevitable consequence of physics. The author of this concept, an associate professor of biophysics at MIT named Jeremy England, has now published the first major papers testing out this idea, and it’s looking like he might be right on the money.
England’s hypothesis is a key bridge between physics and biology. Although it’s not yet conclusively proven, it potentially holds the key to answering one of the greatest questions of all: Where did we come from?
Here’s what his work is arguing. Thanks to the second law of thermodynamics, the universe is heading towards a state of complete structural disorder. It’s tumbling towards a state where everything is essentially the same no matter how the constituent parts are arranged. READ MORE…
Today, November 9th, is officially Carl Sagan Day! In honor of the holiday, we’ve decided to take a quick look at the famous astronomer, cosmologist, and author’s life as well as some of his most memorable quotes. Do you have a Carl Sagan memory you’d like to share? Make sure to comment below and subscribe […]
via November 9th, is officially Carl Sagan Day! — Innovation & Tech Today
We’ll let Veritasium explain..
“In 2010, Erik Verlinde surprised the world with a completely new theory of gravity. According to Verlinde, gravity is not a fundamental force of nature, but an emergent phenomenon. In the same way that temperature arises from the movement of microscopic particles, gravity emerges from the changes of fundamental bits of information, stored in the very structure of spacetime.”
Read More (on The Space Academy)
The Nobel Physics Prize honors big discoveries involving materials often too small to be seen by the naked eye.
via 3 share Nobel physics prize for gravity waves — WKRG
Cassini’s Saturn Mission Goes Out In A Blaze Of Glory NPR RIP, Cassini: Historic Mission Ends with Fiery Plunge into Saturn Space.com NASA’s groundbreaking Cassini probe is dead after 20 years of exploring Saturn on nuclear power Business Insider The Cassini Spacecraft Burns Up In Saturn’s Atmosphere Popular Mechanics Full coverage from Top Stories – Google News http://www.npr.org/sections/thetwo-way/2017/09/15/550709214/cassinis-saturn-mission-goes-out-in-a-blaze-of-glory
via Cassini’s Saturn Mission Goes Out In A Blaze Of Glory — Wanda Posner