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 Constellations

by NASA Marshall Space Flight Center and

: Image Courtesy Liftoff and Marshall Space Flight Center The random arrangement of the stars visible to the naked eye has remained essentially unchanged since the time of the first written records. One of the earliest complete lists we have was compiled in about 120 BC by the Greek astronomer Hipparchus, and all the stars that he described can be found, with the same brightness and in practically the same place, in our skies today. The whole sky has been arbitrarily divided into eighty-eight areas, which differ greatly in size and shape. Each area is a 'constellation,' or group of stars, and was thought to represent a mythical or semi-mythical being. Over half the constellations were recognized and mentioned by Hipparchus (and by Ptolemy, whose star catalogue came down to us through the Moslem scholars as the 'Almagest'). The remaining constellations lie in the Southern Hemisphere and were not named until the sixteenth and seventeenth centuries.

Few of the groups of stars that form constellations look much like the objects they represent. Much imagination is needed to see the 'pictures' seen by those gazing at the skies so many years ago. As the earth moves around the sun in its yearly cycle, the sun appears to 'move' through the constellations. The path is known as the ecliptic. The constellations along the ecliptic were given special significance, and became known as the 'signs of the zodiac'.

In antiquity the beginning of the year was reckoned from the start of spring, called the vernal equinox. The vernal equinox and the autumnal equinox are the two days each year when day and night are equal in length. The constellation through which the sun is passing at the time of vernal equinox changes slowly with the centuries, and therefore the stars associated with the season of spring also change slowly. In the time of Hipparchus the sun was in Aries at the time of vernal equinox; today it is in Pisces, but will soon move into Aquarius (hence we are now at the 'dawning of the age of Aquarius'). From tablets found in the Euphrates valley, we find they started the year when the sun was in the constellation Taurus, the 'Bull in Front'. If the sun was in Taurus at vernal equinox when the constellation was named, the date would have been about 2450 BC!

Does Earth Have Its Own Neon Sign?

You might wonder what the Northern Lights and neon signs have in common. Actually, a lot! What makes luminous colors shimmer across the Northern sky? The answer is in the Sun. Charged particles ar ...
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Backyard Telescopes for New Planets. Is it Possible?

Fifteen years ago, the largest telescopes in the world had yet to locate a planet orbiting another star. Today telescopes no larger than those available in department stores are proving capable of spo ...
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Among the biggest challenges for GP-B is keeping its Science Instrument Assembly constantly cooled to a temperature of 1.8 Kelvin, or minus 271.4 degrees Celsius (slightly above absolute zero), which will last 18 to 24 months.
GP-B: More Than Just a Pretty Face

Questions about the ways space, time, light and gravity relate to each other have been asked for eons. Theories have been offered, yet many puzzles remain to be solved. No spacecraft ever built has re ...
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Science Quote

'Arrows of hate have been shot at me too, but they have never hit me, because somehow they belonged to another world with which I have no connection whatsoever.'

Albert Einstein

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