The pentaquark represents a way to aggregate the fundamental constituents of ordinary protons and neutrons in a pattern that has never been observed before.
Pluto’s bright heart and Charon’s dark spot revealed in HD
New Horizons’ first high-resolution images of Pluto are giving astronomers insight into the dwarf world’s complex ice geology.
Jupiter twin discovered around solar twin
The existence of a Jupiter-mass planet in a Jupiter-like orbit around a Sun-like star opens the possibility that the system of exoplanets around this star may be similar to our solar system.
Measuring the hydrogen Balmer series and Rydberg?s constant with a homemade spectrophotometer
In a recent paper (Amrani 2014 Eur. J. Phys. 35 [http://dx.doi.org/10.1088/0143-0807/35/4/045001]
045001 ), the author presented two different methods to measure the wavelength of visible lines of
Balmer series from the hydrogen atomic spectrum and e…
Visualizing the phenomena of wave interference, phase-shifting and polarization by interactive computer simulations
In this manuscript a computer based simulation is proposed for teaching concepts of interference of
light (under the scheme of a Michelson interferometer), phase-shifting and polarization states. The
user can change some parameters of the interfering…
An RGB approach to extraordinary spectra
After Newton had explained a series of ordinary spectra and Goethe had pointed out its complementary
counterpart, Nussbaumer discovered a series of extraordinary spectra which are geometrically
identical and colourwise analogous to Newton’s and Goe…
The Klein paradox: a new treatment
The Dirac equation requires a treatment of the step potential that differs fundamentally from the
traditional treatment, because the Dirac plane waves, besides momentum and spin, are characterized
by a quantum number with the physical meaning of sign…
Measuring the hydrogen Balmer series and Rydberg’s constant with a homemade spectrophotometer
In a recent paper (Amrani 2014 Eur. J. Phys. 35 [http://dx.doi.org/10.1088/0143-0807/35/4/045001]
045001 ), the author presented two different methods to measure the wavelength of visible lines of
Balmer series from the hydrogen atomic spectrum and e…
Construction of an inexpensive molecular iodine spectrometer using a self-developed Pohl wavemeter around 670 nm wavelength
We describe the construction of an inexpensive iodine spectrometer with a homemade iodine vapour
cell and a self-developed wavemeter based on the Pohl interferometer, around the 670 nm wavelength.
This can be easily realized in an undergraduate teach…
Pluto and Charon show craters, dark spots, and even signs of snow as New Horizons flies by
Mission scientists are thrilled with the data already, and they haven’t even received information from the flyby yet.
Watch MSG-4 launch

Follow the launch of Europe’s next weather satellite live on Wednesday night. MSG-4 is set for liftoff on an Ariane launcher in a 37-minute window starting at 21:42 GMT (23:42 CEST) on 15 July
Density-Functional Theory for Strongly Correlated Bosonic and Fermionic Ultracold Dipolar and Ionic Gases
Author(s): F. Malet, A. Mirtschink, C. B. Mendl, J. Bjerlin, E. Ö. Karabulut, S. M. Reimann, and Paola Gori-Giorgi
An alternative functional for DFT calculations enables simulations of ultracold gases with long-ranged interactions.

[Phys. Rev. Lett. 115, 033006] Published Tue Jul 14, 2015
Dzyaloshinskii-Moriya Interaction and Hall Effects in the Skyrmion Phase of Mn_{1−x} Fe_{x} Ge
Author(s): J. Gayles, F. Freimuth, T. Schena, G. Lani, P. Mavropoulos, R. A. Duine, S. Blügel, J. Sinova, and Y. Mokrousov
A new theoretical treatment of Skyrmions in ferromagnets shows that electron dynamics are governed by Berry phase physics.

[Phys. Rev. Lett. 115, 036602] Published Tue Jul 14, 2015
iriss ground control
Human spaceflight and operations image of the week: ESA astronaut Andreas Mogensen visiting the Columbus Control Centre for the last time before his iriss mission
Astronomy summer school radar observations shine new light on near-Earth asteroid
The images reveal an elongated object that is only 260 feet (80 meters) across at its widest point.
NASA’s three-billion-mile journey to Pluto reaches historic encounter
New Horizons made closest approach to the distant world at 7:50 a.m. EDT this morning.
Live coverage: New Horizons’ historic Pluto flyby
Twenty-five years in the making, this close-up examination of the Pluto system represents the capstone of the first era of planet reconnaissance.
Europe advances with safer air travel

A safer airspace over Europe by 2018 is materialising as ESA’s Iris precursor project today began development with the unlocking of a further €7.6 million of funding.
MSG-4 launch timeline

On 15 July, a powerful Ariane launcher will loft Europe’s final Meteosat Second Generation weather satellite into orbit from Kourou, French Guiana. For the mission control team at ESA, liftoff will mark the end of months of careful preparations and the start of the mission’s first critical phase.
How big is Pluto? New Horizons settles decades-long debate
Based on the most recent data, Pluto is actually larger than previous conservative estimates, making it the largest of all known solar system objects beyond Neptune.
Experimental Test of Entropic Noise-Disturbance Uncertainty Relations for Spin-1/2 Measurements
Author(s): Georg Sulyok, Stephan Sponar, Bülent Demirel, Francesco Buscemi, Michael J. W. Hall, Masanao Ozawa, and Yuji Hasegawa
Experiments on neutrons confirm an information-theoretic formulation of Heisenberg’s noise-disturbance uncertainty principle: There is a reciprocal trade-off in knowledge of two incompatible spin observables.

[Phys. Rev. Lett. 115, 030401] Published Mon Jul 13, 2015
Preparing for launch
MSG-4 is set for launch on Wednesday night. Learn more about the European weather satellite with ESA TV
Rosetta: preparing for perihelion

Rosetta’s investigations of its comet are continuing as the mission teams count down the last month to perihelion – the closest point to the Sun along the comet’s orbit – when the comet’s activity is expected to be at its highest.
Fermi sees record flare from a black hole in a distant galaxy
One day 3C 279 was just one of many active galaxies scientists see, and the next day it was the brightest thing in the gamma-ray sky.
Searing Sun seen in X-rays
NASA’s NuSTAR usually examines the mysteries of black holes, supernovae, and other high-energy objects, but it occasionally looks closer to home to study our star.
Pioneering Rosetta mission scientist Claudia Alexander dead at 56
As a research scientist, she inspired a generation, especially young women, to seek careers in science, technology, engineering and math.
Here comes the Sun
Space Science Image of the Week: 20 SOHO snapshots of our Sun, one for each year of operations
Robots under test for oil and gas rig duty

A robot building on ESA’s ExoMars rover is bidding to win a place on oil and gas production rigs around the world, to work in remote and hazardous environments.
New Horizons’ last portrait of Pluto’s puzzling spots
While composition and color data still need to be downlinked, this hemisphere will be invisible to New Horizons during the July 14 flyby.
New image of Pluto: “Houston, we have geology”
Among the structures tentatively identified in this new image are what appear to be polygonal features, a complex band of terrain stretching east-northeast across the planet, and a complex region where bright terrains meet the dark terrains of the “wha…
SMAP Team Investigating Radar Instrument Anomaly
Mission managers at NASA’s Jet Propulsion Laboratory, Pasadena, California, are assessing an anomaly with the radar instrument on NASA’s Soil Moisture Active Passive (SMAP) satellite observatory.
NASA’s Curiosity Mars Rover Tracks Sunspots
Curiosity is monitoring sunspots on the side of the sun facing away from Earth, during weeks when sun-monitoring spacecraft can’t provide that information.
Week In Images
Our week through the lens: 6-10 July 2015
Gigantic early black hole could upend evolutionary theory
Because the galaxy the 7-billion-solar-mass black hole was discovered in is fairly typical in size, the study calls into question previous assumptions on the development of galaxies.
Swift reveals a black hole bull’s-eye
The satellite detected the start of a new outburst from V404 Cygni, where a black hole and a Sun-like star orbit each other.
Astronomy enthusiasts fear losing access to Mauna Kea permanently
A proposed rule change aimed at thwarting TMT protestors could block public access to some of the most pristine dark skies on Earth.
Pluto and Charon: New Horizons’ Dynamic Duo
The two worlds orbit the same gravitational point, but their similarities seem to end there.
NASA Missions Have Their Eyes Peeled on Pluto
NASA’s New Horizons will have the support of other spacecraft during its historic Pluto flyby, with observations from their outposts across the solar system.
NASA Finds Oceans Slowed Global Temperature Rise
A NASA study shows heat has been trapped in the Pacific and Indian oceans. The finding explains the recent slowdown in global temperature rise.
Distant Black Hole Wave Twists Like Giant Whip
Magnetic waves from a black hole are set in motion as if a whip is being cracked.
iriss for kids
ESA astronaut Andreas Mogensen narrates this animated story about his iriss mission to space starting September
ESA in UK
The flags are raised at the new Roy Gibson building at ESA ECSAT in UK, 9 July
Chameleon satellite to revolutionise telecom market
Telecom satellites are set to enter a new age, as ESA, Eutelsat and Airbus Defence & Space begin designing the most flexible payload ever.
Earth from Space

Join us Friday, 10 July, at 10:00 CEST for the ‘Earth from Space’ video programme. This week features the sandy and rocky terrain of the Sahara desert as seen by Sentinel-2
Radio astronomers see black hole come to life
A new study shows convincing evidence of the “switching on” of the active phase in a black hole at the center of galaxy NGC 660.
Huge new survey to shine light on dark matter
The first KiDS survey results show how the characteristics of the observed galaxies are determined by the invisible vast clumps of dark matter surrounding them.
A “heart” from Pluto as flyby begins
The New Horizons mission has officially begun the flyby sequence of science observations that will culminate with closest approach July 14.
Cutting through martian history
This colourful image resembles an abstract watercolour, but it is in fact a colour-coded topographic map of one of the most geologically diverse regions on Mars.
ESA teams ready for Europe’s next weather satellite

Ground control teams are ready to shepherd Europe’s next weather satellite through its critical first days in orbit, ensuring it is working and healthy in the harsh environment of space.
Searing Sun Seen in X-rays
A bouquet of colors highlights X-rays streaming off our sun.
Reentry rockers
Technology image of the week: UK band Public Service Broadcasting examine a reentry capsule during a recent visit to ESA’s technical heart
Optically Induced Nuclear Spin Polarization in the Quantum Hall Regime: The Effect of Electron Spin Polarization through Exciton and Trion Excitations
Author(s): K. Akiba, S. Kanasugi, T. Yuge, K. Nagase, and Y. HirayamaThe nuclear spins of Gallium and Arsenic are manipulated optically, providing an alternative to traditional qubits for quantum information processing.[Phys. Rev. Lett. 115, 026804] Pu…
Neptune’s badly behaved magnetic field
New computer simulations show that the distant planet’s magnetic field is constantly rotating and changing.
Some long-duration gamma-ray bursts are driven by magnetars
A new study reveals that a supernova discovered after a gamma-ray burst must have been powered by a highly magnetic neutron star.
New Horizons map of Pluto: The whale and the doughnut
While the new maps gives mission scientists an important tool for deciphering the patterns of bright and dark markings on the distant planet’s surface, they are holding off on making any interpretations of features for now.
NASA Selects Leading-Edge Technology Concepts for Continued Study
NASA has selected seven technology proposals for continued study under Phase II of the agency’s Innovative Advanced Concepts (NIAC) Program, including one from JPL.
With One Year to Jupiter, NASA’s Juno Team Prepares
With one year remaining in a five-year trek, NASA’s Juno mission team is preparing for the spacecraft’s expedition to the solar system’s largest planet.
Station Moon transit
Human spaceflight and operations image of the week: the International Space Station crosses the Moon seen from Australia
Cosmology looks beyond the standard model
A special session at the National Astronomy Meeting has been convened for astronomers to take stock of the evidence and stimulate further investigation of cosmology beyond the standard model.
Pluto dark spots continue to intrigue
These regularly spaced patches are each hundreds of miles across.
Rings and loops in the stars: Planck’s stunning new images
The new maps show regions of the sky that produce anomalous microwave emission.
Pluto: The “other” red planet
Pluto’s reddish color has been known for decades, but New Horizons is now allowing scientists to correlate the color of different places on the surface with their geology and soon with their compositions.
Dawn Holding in Second Mapping Orbit
NASA’s Dawn spacecraft is healthy and stable, after experiencing an anomaly in the system that controls its orientation.
Opportunity Rover’s 7th Mars Winter to Include New Study Area
NASA’s Opportunity rover has resumed driving after Mars emerged from behind the sun. Plans call for the rover to examine sites in Marathon Valley during the upcoming winter.
NuSTAR Stares Deep into Hidden Lairs of Black Holes
The high-energy X-ray eyes of NASA’s NuSTAR have peered into some of the most heavily buried supermassive black holes known.
Astronomers use cosmic gravity to create a ‘black-hole-scope’
The Integral, Fermi and Swift space observatories have used the magnifying power of a cosmic lens to explore the inner regions of a supermassive black hole.
Share the Sun
Share your summer pictures with the crew in Concordia research station in Antarctica, who have not seen the Sun since 4 May
Shear Viscosity of a Unitary Fermi Gas Near the Superfluid Phase Transition
Author(s): J. A. Joseph, E. Elliott, and J. E. Thomas
Measurements of a Fermi gas below the superfluid transition temperature provide the first determination of the local shear viscosity, revealing features that were hidden in previous trap-averaged measurements.

[Phys. Rev. Lett. 115, 020401] Published Mon Jul 06, 2015
Hybrid Matter-Wave–Microwave Solitons Produced by the Local-Field Effect
Author(s): Jieli Qin, Guangjiong Dong, and Boris A. MalomedA new species of matter-wave-microwave solitons is predicted in the ground state of a spinor gas. The state is a result of short-range attractive interactions between spinors, and long-range, g…
Europa’s blood-red scars

Space Science Image of the Week: The criss-crossing scars marking the surface of Jupiter’s icy moon Europa in this Galileo image look disturbingly biological
Universe’s hidden supermassive black holes revealed
A team of scientists using NuSTAR detected high-energy X-rays from five supermassive black holes previously clouded from direct view by dust and gas.
Astronomers see pebbles poised to make planets
Although scientists thought this is how planets form, this is the first time they’ve actually seen the process in action.
NASA’s New Horizons to return to normal science operations after spacecraft anomaly
Preparations are ongoing to resume the originally planned science operations July 7 and to conduct the entire close flyby sequence as planned.
Luca Parmitano: this year’s Captain NEEMO

ESA astronaut Luca Parmitano is to lead NASA’s 20th underwater astronaut training mission this month. Starting on 20 July, the 14-day NASA Extreme Environment Mission Operations sortie, or NEEMO, will see a team of four living and working in the Aquarius underwater research station off the coast of Florida, USA.
Week In Images
Our week through the lens: 29 June – 3 July 2015
Counting stars with Gaia

This image, based on housekeeping data from ESA’s Gaia satellite, is no ordinary depiction of the heavens. While the image portrays the outline of our Galaxy, the Milky Way, and of its neighbouring Magellanic Clouds, it was obtained in a rather unusual way.
Northwest Sardinia
Earth observation image of the week: a false-colour image from Sentinel-2A over part of the Italian island of Sardinia, also featured on the Earth from Space video programme
Stellar Sparklers That Last
A new image containing data from NASA’s Spitzer and Chandra space telescopes shows a cluster of young stars expected to burn for billions of years.
Earth from Space

Join us Friday, 3 July, at 10:00 CEST for the ‘Earth from Space’ video programme. This week features an image over northwest Sardinia – one of the first from the Sentinel-2 mission
Spots on Pluto fascinate as New Horizons gets the all clear
Not finding new moons or rings is a bit of a scientific surprise, but as a result, no engine burn is needed to steer clear of potential hazards.
Rosetta spacecraft sees sinkholes on comet
These circular pits on Comet 67P/Churyumov-Gerasimenko likely formed when ices beneath the surface turned directly to gas.
NASA Maps Beach Tar from California Oil Pipeline Spill
When an oil spill sullied beaches near Santa Barbara, California, in May, a JPL airborne instrument tested new techniques that may help responders after future oil spills.
NASA Takes to Kansas Skies to Study Nighttime Thunderstorms
In most of the U.S., summer thunderstorms form on hot days. In the Great Plains, they often form at night. NASA is joining a multi-agency field campaign to learn why.
NASA’s Curiosity Mars Rover Studies Rock-Layer Contact Zone
As Mars emerges from passing nearly behind the sun, NASA has resumed full operations of the Curiosity rover, which has reached a site where at least two rock types meet.
Comet sinkholes generate jets

A number of the dust jets emerging from Rosetta’s comet can be traced back to active pits that were likely formed by a sudden collapse of the surface. These ‘sinkholes’ are providing a glimpse at the chaotic and diverse interior of the comet.
Tuning the Liquid-Liquid Transition by Modulating the Hydrogen-Bond Angular Flexibility in a Model for Water
Author(s): Frank Smallenburg and Francesco SciortinoA liquid-liquid transition with no intervening ice stage is predicted in supercooled water when the hydrogen bond flexibility is tuned.[Phys. Rev. Lett. 115, 015701] Published Wed Jul 01, 2015
Unexpectedly little black hole monsters rapidly suck up surrounding matter
Such “supercritical accretion” produces powerful outflows in the form of a dense disk wind coming from these ultra-luminous X-ray sources.
Buried in the heart of a giant
NGC 2367 is an infant stellar grouping that lies at the center of an immense and ancient structure on the margins of the Milky Way.
Ice mountains
Technology image of the week: original technology demonstration mission Proba-1 images the site of Antarctica’s first zero-emission base
My first day at ESA
First blog post by Jan Woerner, on taking up duty as ESA Director General
Director General
Meet Johann-Dietrich Woerner
NASA Explains Why June 30 Will Get Extra Second
The day will officially be a bit longer than usual on Tuesday, June 30, 2015, because an extra second, or “leap” second, will be added.
Surrounded by Gaia
Human spaceflight and operations image of the week: Gaia avionics model settles into new home
Increasingly active comet
Space Science image of the week: Rosetta is monitoring the ever-increasing activity of the comet as they move closer to the Sun
Helping Europe prepare for asteroid risk
Each year, astronomers worldwide discover over 1000 new asteroids or other space rocks that could strike our planet. And if one is spotted heading towards Earth, experts working in ESA and national emergency offices need to know who should…
Life on Mars?
As the 2016 spacecraft nears completion, mission scientists explain how the ExoMars programme will help in the search for life on Mars
Speak to Peake
Watch a replay of the hangout with ESA astronaut Tim Peake
Exposed water ice detected on Rosetta comet’s surface
Scientists have identified 120 bright regions on the surface of Comet 67P/Churyumov-Gerasimenko.
New Horizons sees Pluto’s “bright fringe,” Charon’s “dark pole”
Scientists on the New Horizons team have found that the “close approach hemisphere” on Pluto has the greatest variety of terrain types seen on the planet so far.
Expert asteroid answers
Your asteroid questions answered by ESA experts, for World Asteroid Day