PhysLink.com Logo
Science Fair Supplies Sale
Science Fair Supplies Sale

Physics & Astronomy News


<p>Lithospheric magnetic field</p>

<p>Courtesy: ESA</p>
Earth’s Magnetic Field Reveals Details Of A Dramatic Past
ESA’s Swarm satellites are seeing fine details in one of the most difficult layers of Earth’s magnetic field to unpick – as well as our planet’s magnetic history imprinted on Earth’s crust.
<p>Evolution of a spin and its uncertainty as they orbit due to a magnetic field</p>

<p>Courtesy of: ICFO</p>
Scientists Evade The Heisenberg Uncertainty Principle
The study, published in Nature, reports a technique to bypass the Heisenberg uncertainty principle.

<p>Image courtesy of NCSU</p>
Using Light to Control Curvature of Plastics
Researchers have developed a technique that uses light to get two-dimensional (2-D) plastic sheets to curve into three-dimensional (3-D) structures, such as spheres, tubes or bowls.
<p>This spectacular image from the VLT Survey Telescope shows the Cat’s Paw Nebula (NGC 6334, upper right) and the Lobster Nebula (NGC 6357, lower left). These dramatic objects are regions of active star formation where the hot young stars are causing the surrounding hydrogen gas to glow red. The very rich field of view also includes dark clouds of dust. With around two billion pixels this is one of the largest images ever released by ESO. A zoomable version of this giant image is available here.</p>

<p>Note that the circular features in the image around bright stars are not real, they are due to reflections within the optics of the telescope and camera.</p>

<p>Credit:</p>

<p>ESO</p>
The Cat’s Paw and Lobster Nebulae
The beautiful, glowing, cosmic clouds of gas and dust catalogued as NGC 6334 and NGC 6357 now have new names.


First Look at Magnetism of Real Nanoparticle
Scientist help solve a unique problem: to model magnetism at the atomic level using experimental data from a real nanoparticle.
Dark Matter May be Smoother than Expected
Analysis of a giant new galaxy survey suggests that dark matter may be less dense and more smoothly distributed throughout space than previously thought.
Holograms from Neutrons Created
For the first time, scientists have used neutron beams to create holograms of large solid objects, revealing details about their interiors in ways that ordinary laser light-based visual holograms cannot.

Science Facts

Why Does A Golf Ball Have Dimples?

by Jani Macari Pallis and ScienceIQ.com

Golf Ball: Image Copyright © 2002 Cislunar Aerospace, Inc. A golf ball can be driven great distances down the fairway. How is this possible? The answer to this question can be found by looking at the aerodynamic drag on a sphere without dimples (while it's flying through the air!). The first kind of drag is the obvious drag due to friction. But, this is only a small part of the drag experienced by a ball. Most of the drag comes from the 'separation of the flow' as the ball sails through the air. For laminar (smooth) flow past a sphere, the flow separates very early. Compare this with a 'turbulent flow', caused by a marked or dimpled surface. Flow separation is delayed. The larger (or early) flow separation causes a larger pressure drag on the sphere (golf ball). The rough or dimpled surface causes 'turbulence' which delays or narrows the flow separation. This lowers the pressure drag. On a smooth sphere (golf ball) the faster the ball moves, the more drag is produced. On a rough sphere, speed does not change the drag very much.

Although round dimples are accepted as the standard, many other shapes were tried. Hexagons (six sided) resulted in lower drag than round dimples, so maybe in the future we will see golf balls with hexagonal dimples.


The brilliant stars seen in this image are members of the popular open star cluster known as the Pleiades, or Seven Sisters.
How Far Are The Seven Sisters?

The Pleiades cluster, named by the ancient Greeks, is easily seen as a small grouping of stars lying near the shoulder of Taurus, the Bull, in the winter sky. Although it might be expected that the di ...
continue reading this fact

Magnitude of an Astronomical Object

'Visual magnitude' is a scale used by astronomers to measure the brightness of a star. The term 'visual' means the brightness is being measured in the visible part of the spectrum, the part you can se ...
continue reading this fact
NASA
It's a Supernova

Scientists have discovered that one of the brightest gamma ray bursts on record is also a supernova. It's the first direct evidence linking these two types of explosions, both triggered by the death o ...
continue reading this fact


Get $10 OFF glasses at EyeBuyDirect.com

Science Quote

'The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.'

Albert Einstein
(1879-1955)


All rights reserved. © Copyright '1995-'2017 PhysLink.com