Profile cover photo
Profile photo
John Dye
2,924 followers -
Gulkana, Alaska
Gulkana, Alaska

2,924 followers
About
John's posts

Post has shared content

Post has shared content
Something's just don't change over time, as this youngster takes his favorite bears for a ride.
Photo

Post has shared content
Astronomers find unexpected, dust-obscured star formation in distant galaxy

Pushing the limits of the largest single-aperture millimeter telescope in the world, and coupling it with gravitational lensing, University of Massachusetts Amherst astronomer Alexandra Pope and colleagues report that they have detected a surprising rate of star formation, four times higher than previously detected, in a dust-obscured galaxy behind a Frontier Fields cluster.

As Pope explains, "This very distant, relatively typical galaxy is known to us, and we knew it was forming stars, but we had no idea what its real star-formation rate was because there is so much dust surrounding it. Previous observations couldn't reach past that. Finding out that 75 percent of its star formation was obscured by dust is remarkable and intriguing. These observations clearly show that we have more to learn."

She adds, "Historians want to know how civilizations were built up, and we astronomers want to know where and how the elements in the universe were formed and where everything is made of, came from." The study is accepted for publication in The Astrophysical Journal.

The new tool that has made such revelations possible is the 50-meter Large Millimeter Telescope (LMT) which has been observing as a 32-meter telescope located on an extinct volcano in central Mexico in "early science mode" since 2013. Operated jointly by UMass Amherst and Mexico's Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), it offers astonishing new power to peer into dusty galaxies, the astrophysicist says.

https://phys.org/news/2017-03-astronomers-unexpected-dust-obscured-star-formation.html
Photo

Post has shared content
OTD in 1749 - Pierre-Simon Laplace was born (23 March 1749 – 5 March 1827).

Pierre Simon, Marquis de Laplace was a French mathematician, physicist, statistician and astronomer known for his mathematical analysis of the stability of the solar system (1773), alleviating Isaac Newton's concerns about perturbations between planets. He took an exact approach to science. He developed an explanation of surface tension of a liquid in terms of inter-molecular attractions, investigated capillary action and the speed of sound. He assisted Antoine Lavoisier (1783) investigating specific heat and heats of combustion, initiating the science of thermochemistry. He believed the solar system formed from a collapsing nebula. He contributed to the mathematics of probability and calculus, in which a differential equation is known by his name, and was involved in establishing the metric system. Via TiS.
Photo

Post has shared content
The strange star discovered by Planet Hunters

A very ordinary, isolated star varies by 20% in brightness on time scales from a day to a century. No one has yet proposed a convincing explanation.

The star KIC 8462852 is reasonably advertised as the most mysterious star in our galaxy. It is by almost all measures a perfectly ordinary F2 main-sequence star, which is to say that it is middle-aged and stable. At a temperature of 6750 K, it’s a bit hotter than our sun, and at 1.43 solar masses, it’s a bit more massive too. Until 2015 the star was unnoticed in the wing of the constellation Cygnus (the Swan), though at a distance of about 1500 light-years and an optical magnitude of about 12, the star is visible with a small telescope. When it was noticed, it created quite a splash.

http://physicstoday.scitation.org/doi/full/10.1063/PT.3.3504
Photo

Post has shared content
This is just breathtaking... A short video to the previous post:

Hubble Detects a Rogue Supermassive Black Hole

The Hubble Space Telescope captured an image of a quasar named 3C 186 that is offset from the center of its galaxy. Astronomers hypothesize that this supermassive black hole was jettisoned from the center of its galaxy by the recoil from gravitational waves produced by the merging of two supermassive black holes.

Credit: NASA’s Goddard Space Flight Center/Katrina Jackson

https://www.youtube.com/watch?v=K09zNxtJ11s


Animated Photo

Post has shared content

Post has shared content

Post has shared content
#RosettaOSIRIS Image of the Day: Comet #67P on 06 Mar 16 from a distance of 20km 

Credit: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA 

Read more: https://planetgate.mps.mpg.de/Image_of_the_Day/public/OSIRIS_IofD_2016-03-07.html
Photo

Post has shared content
Scientists evade the Heisenberg uncertainty principle

ICFO Researchers report the discovery of a new technique that could drastically improve the sensitivity of instruments such as magnetic resonance imagers (MRIs) and atomic clocks. The study, published in Nature, reports a technique to bypass the Heisenberg uncertainty principle. This technique hides quantum uncertainty in atomic features not seen by the instrument, allowing the scientists to make very high precision measurements.

Read more : https://www.google.com/amp/s/phys.org/news/2017-03-scientists-evade-heisenberg-uncertainty-principle.amp

The evolution of a spin and its uncertainty as they orbit due to a magnetic field. The uncertainty, initially equal in all directions, is squeezed into only the out-of-plane component, leaving the two in-plane components highly certain. Credit: ICFO
Photo
Wait while more posts are being loaded