Physics & Astronomy News

<p>Hologram of a single photon: reconstructed from raw measurements (left) and theoretically predicted (right).</p>

<p>Image Source: FUW</p>
Single light particle hologram created
Scientists at have created the first ever hologram of a single light particle.
<p>A new process allows materials synthesized at the nano-level to be scaled to larger sizes to take advantage of their mechanical, optical, and energy properties. Xiaoyu 'Rayne' Zheng, assistant professor of mechanical engineering, describes the process in the journal Nature Materials.</p>
Upsizing nanostructures into 3-D printed materials
A new process allows materials synthesized at the nano-level to be scaled to larger sizes to take advantage of their mechanical, optical, and energy properties.

<p>An artist’s portrayal of a Warm Jupiter gas-giant planet (r.) in orbit around its parent star, along with smaller companion planets. Image credit: Detlev Van Ravenswaay/Science Photo Library</p>
Warm Jupiters Not As Lonely As Expected
Astronomers have given us our clearest understanding yet of a class of exoplanets called “Warm Jupiters”, showing that many have unexpected planetary companions.
<p>STM scan (96 nm wide, 126 nm tall) of the 1 kB memory, written to a section of Feynman’s lecture There’s Plenty of Room at the Bottom (with text markup)</p>

<p><br />
Image courtesy: TUDelft</p>
Tiny hard disk writes information atom by atom
A team of scientists to build a memory of 1 kilobyte (8,000 bits), where each bit is represented by the position of one single chlorine atom.

Dark Energy Measured with Record-Breaking Map of 1.2 Million Galaxies
Physicists and astronomers have announced results from the largest-ever, three-dimensional map of distant galaxies.
What Did Earth’s Ancient Magnetic Field Look Like?
New work suggests Earth’s ancient magnetic field was significantly different than the present day field, originating from several poles rather than the familiar two.
Scientists’ Breakthrough In Modelling Universe
Research teams in Europe and the USA have begun modelling the universe for the first time using Einstein’s full general theory of relativity.

Science Facts

The Sun’s Corona

by NASA Headquarters and

: Image Courtesy NASA The White-Light Corona - The Corona is the Sun's outer atmosphere. It is visible during total eclipses of the Sun as a pearly white crown surrounding the Sun. The corona displays a variety of features including streamers, plumes, and loops. These features change from eclipse to eclipse and the overall shape of the corona changes with the sunspot cycle. However, during the few fleeting minutes of totality few, if any, changes are seen in these coronal features.

The Emission Line Corona - Early observations of the visible spectrum of the corona revealed bright emission lines at wavelengths that did not correspond to any known materials. This led astronomers to propose the existence of 'coronium' as the principal gas in the corona. The true nature of the corona remained a mystery until it was determined that the coronal gases are super-heated to temperatures greater than 1,000,000C (1,800,000F). At these high temperatures both hydrogen and helium (the two dominant elements) are completely stripped of their electrons. Even minor elements like carbon, nitrogen, and oxygen are stripped down to bare nuclei. Only the heavier trace elements like iron and calcium are able to retain a few of their electrons in this intense heat. It is emission from these highly ionized elements that produces the spectral emission lines that were so mysterious to early astronomers. We can now produce artificial eclipses in coronagraphs that cover the disk of the Sun and filter out everything except the emission due to these coronal ions.

The X-Ray Corona - The corona shines brightly in x-rays because of its high temperature. On the other hand, the 'cool' solar photosphere emits very few x-rays. This allows us to view the corona across the disk of the Sun when we observe the Sun in X-rays. To do this we must first design optics that can image x-rays and then we must get above the Earth's atmosphere. In the early 70's Skylab carried an x-ray telescope that revealed coronal holes and coronal bright points for the first time. During the last decade Yohkoh, provided a wealth of information and images on the sun's corona. Today we have the SOHO and TRACE satellites obtaining new and exciting observations of the Sun's corona, its features, and its dynamic character.

An artist
Ancient Planet

Long before our Sun and Earth ever existed, a Jupiter-sized planet formed around a sun-like star. Now, almost 13 billion years later, NASA's Hubble Space Telescope has precisely measured the mass of t ...
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This image shows the comet Wild 2, which NASA
NASA Spacecraft Reveals Surprising Anatomy Of A Comet

Findings from a historic encounter between NASA's Stardust spacecraft and a comet have revealed a much stranger world than previously believed. The comet's rigid surface, dotted with towering pinnacle ...
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Images from the EIT (Extreme-ultraviolet Imaging Telescope) instrument on the SOHO spacecraft.
Ultraviolet Light

Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the 'electromagnetic spectrum'. Radiated energy, or radiation, is given off by many objects ...
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Science Quote

'Never regard study as a duty, but as the enviable opportunity to learn to know the liberating influence of beauty in the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.'

Albert Einstein

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