Category: physics

First woman Physics Nobel winner in 55 years

First woman Physics Nobel winner in 55 years:

pheministphysicists:

Donna Strickland, from Canada, is only the third woman winner of the award, along with Marie Curie, who won in 1903, and Maria Goeppert-Mayer, who was awarded the prize in 1963.

Dr Strickland shares this year’s prize with Arthur Ashkin, from the US, and Gerard Mourou, from France.

It recognises their discoveries in the field of laser physics.

[Read More]

Excerpt: “Mars Calling” on Amazon Video.

Excerpt: “Mars Calling” on Amazon Video.

Using All of Our Senses in Space

nasa:

Today, we and the National Science Foundation (NSF) announced the detection of light and a high-energy cosmic particle that both came from near a black hole billions of trillions of miles from Earth. This discovery is a big step forward in the field of multimessenger astronomy.

But wait — what is multimessenger astronomy? And why is it a big deal?

People learn about different objects through their senses: sight, touch, taste, hearing and smell. Similarly, multimessenger astronomy allows us to study the same astronomical object or event through a variety of “messengers,” which include light of all wavelengths, cosmic ray particles, gravitational waves, and neutrinos — speedy tiny particles that weigh almost nothing and rarely interact with anything. By receiving and combining different pieces of information from these different messengers, we can learn much more about these objects and events than we would from just one.

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Lights, Detector, Action!  

Much of what we know about the universe comes just from different wavelengths of light. We study the rotations of galaxies through radio waves and visible light, investigate the eating habits of black holes through X-rays and gamma rays, and peer into dusty star-forming regions through infrared light.

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The Fermi Gamma-ray Space Telescope, which recently turned 10, studies the universe by detecting gamma rays — the highest-energy form of light. This allows us to investigate some of the most extreme objects in the universe.

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Last fall, Fermi was involved in another multimessenger finding — the very first detection of light and gravitational waves from the same source, two merging neutron stars. In that instance, light and gravitational waves were the messengers that gave us a better understanding of the neutron stars and their explosive merger into a black hole.

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Fermi has also advanced our understanding of blazars, which are galaxies with supermassive black holes at their centers. Black holes are famous for drawing material into them. But with blazars, some material near the black hole shoots outward in a pair of fast-moving jets. With blazars, one of those jets points directly at us!

Multimessenger Astronomy is Cool

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Today’s announcement combines another pair of messengers. The IceCube Neutrino Observatory lies a mile under the ice in Antarctica and uses the ice itself to detect neutrinos. When IceCube caught a super-high-energy neutrino and traced its origin to a specific area of the sky, they alerted the astronomical community.

Fermi completes a scan of the entire sky about every three hours, monitoring thousands of blazars among all the bright gamma-ray sources it sees. For months it had observed a blazar producing more gamma rays than usual. Flaring is a common characteristic in blazars, so this did not attract special attention. But when the alert from IceCube came through about a neutrino coming from that same patch of sky, and the Fermi data were analyzed, this flare became a big deal!

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IceCube, Fermi, and followup observations all link this neutrino to a blazar called TXS 0506+056. This event connects a neutrino to a supermassive black hole for the very first time.  

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Why is this such a big deal? And why haven’t we done it before? Detecting a neutrino is hard since it doesn’t interact easily with matter and can travel unaffected great distances through the universe. Neutrinos are passing through you right now and you can’t even feel a thing!

The neat thing about this discovery — and multimessenger astronomy in general — is how much more we can learn by combining observations. This blazar/neutrino connection, for example, tells us that it was protons being accelerated by the blazar’s jet. Our study of blazars, neutrinos, and other objects and events in the universe will continue with many more exciting multimessenger discoveries to come in the future.

Want to know more? Read the story HERE.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

fuckyeahfluiddynamics: There are many ways to…

fuckyeahfluiddynamics:

There are many ways to repel droplets from a surface: water droplets will bounce off superhydrophobic surfaces due to their nanoscale structures; a vibrating liquid pool can keep droplets bouncing thanks to its deformation and a thin air layer trapped under the drop; and heated surfaces can repel droplets with the Leidenfrost effect by vaporizing a layer of liquid beneath the droplet. But all of these methods will only work for certain liquids under specific circumstances. 

More recently, researchers have begun looking at a different way to repel droplets: moving the surface. The motion of the plate drags a layer of air with it; how thick that layer of air is depends on the plate’s speed. (Faster plates make thinner air layers.) Above a critical plate speed, a falling droplet will impact without touching the plate directly and will rebound completely. This works for many kinds of liquids – the researchers used silicone oil, water, and ethanol – across many droplet sizes and speeds. The key is that the air dragged by the plate deforms the droplet and creates a lift force. If that lift force is greater than the inertia of the droplet, it bounces. (Image and research credit: A. Gauthier et al., source)

Space diamonds ‘came from lost planet’

Space diamonds ‘came from lost planet’:

mindblowingscience:

A diamond-bearing space rock that exploded in Earth’s atmosphere in 2008 was part of a lost planet from the early Solar System, a study suggests.

The parent “proto-planet” would have existed billions of years ago before breaking up in a collision and was about as large as Mercury or Mars.

A team has published their results in the journal Nature Communications.

They argue that the pressures necessary to produce diamonds of this kind could only occur in planet of this size.

Continue Reading.

garadinervi: William Bragg, (1925), Concerning…

garadinervi:

William Bragg, (1925), Concerning the Nature of Things, Dover Publications, Inc., New York, NY, 1948

cosmicfunnies: cosmicfunnies: http://www.skya…

cosmicfunnies:

cosmicfunnies:

http://www.skyandtelescope.com/astronomy-news/black-hole-flees-behemoth-galaxy/Better late than never! Here’s a scary story about runaway black holes!

Starring guest speaker Lapetus!

http://www.iflscience.com/space/nasa-is-hunting-down-a-runaway-black-hole/

http://www.iflscience.com/space/runaway-black-hole-might-have-been-propelled-by-gravitational-waves/

It’s black hole Friday! Lets celebrate by enjoying black hole related comics!

s-c-i-guy: GW170817 Infographic by Daniel Williams

s-c-i-guy:

GW170817 Infographic

by Daniel Williams