This discovery supports the idea that planets form in much shorter timescales than previously thought and prompts a reconsideration of alternative planet formation scenarios.
Having fun with a cordless mouse
A cordless mouse with an added reed switch is used as a wireless data logger to record every time
the wheel of a trolley completes a revolution. The limitations of the system in terms of maximum
clicking rate and spatial resolution are considered and…
Using basic electromagnetism to introduce LINAC4 (CERN)
The LHC is the last element of CERN’s accelerator complex, which is a succession of machines with
increasingly higher energies. Everything starts in the 50 MeV linear accelerator (LINAC2), but a new
linear accelerator, the 160 MeV LINAC4, will repl…
NASA Telescopes Find Clues For How Giant Black Holes Formed So Quickly
Using data from NASA’s Great Observatories, astronomers have found the best evidence yet for cosmic seeds in the early universe that should grow into supermassive black holes.
Space fashion
Human spaceflight and robotic exploration image of the week: Weightlessness inspiring new fashion designers with Couture in Orbit
14 and counting
Europe now has 14 Galileo navigation satellites in orbit after its latest launch success
And yet it moves: 14 Galileo satellites now in orbit

Named for the astronomer who pinpointed Earth’s true position in the Solar System, the Galileo satellite navigation system that will help Europe find its way in the 21st century now has 14 satellites in orbit after today’s double launch.
NASA telescopes find clues for how giant black holes formed so quickly
Scientists found evidence that supermassive black hole seeds can form directly from the collapse of a giant gas cloud, skipping any intermediate steps.
Astronomers discover fresh lunar craters
New technique allows scientists to “age” craters in the Moon’s darkest regions
Galileo launch coverage
Full replay of the launch and separation coverage of Europe’s thirteenth and fourteenth Galileo satellites
Galileo liftoff replay
Europe’s 13th and 14th Galileo satellites lifted off by Soyuz on 08:48 GMT – watch replay here
Lecture demonstrations of relativity of electric and magnetic fields
Students can obtain further insight into the physical essence of the principle of relativity if they
experimentally investigate the phenomenon of electromagnetic induction in various reference frames.
For this purpose we propose a special apparatus. …
Comment on ‘Redshift formulas and the Doppler–Fizeau effect’
In this comment, some remarks are proposed on José-Philippe Pérez’s article ‘Redshift formulas and
the Doppler–Fizeau effect’ (2016 Eur. J. Phys. 37 015604
[http://dx.doi.org/10.1088/0143-0807/37/1/015604] ). Presentation of the gravitation…
A tale of two oscillators
It is not always easy to find problems in classical mechanics that can be solved with the use of
knowledge in quantum mechanics. In this short note we present such an example. The problem is that
of a bead which is free to move on an infinite rigid r…
A simple explanation of the classic hydrostatic paradox
An interesting problem in fluid mechanics, with significant educational importance, is the classic
hydrostatic paradox. The hydrostatic paradox states the fact that in different shaped containers,
with the same base area, which are filled with a liqu…
Putting new energy into fashion
An ESA-backed start-up company is working with fashion students to incorporate energy-harvesting devices in new space-inspired high-fashion designs. The results will be unveiled on a catwalk at the London Science Museum on 25 May.
Are mystery Mars plumes caused by space weather?
Mysterious high-rise clouds seen appearing suddenly in the martian atmosphere on a handful of occasions may be linked to space weather, say Mars Express scientists.
Little fox’s starry heart
Space science image of the week: An infrared view inside a distant star nursery has revealed a surprising amount of structure in the cloud
Missed Slooh’s Mars opposition show? Rewatch it here
There’s still plenty of time to see Mars this summer, but here’s the main event.
Are Mars’ mysterious plumes caused by space weather?
Mysterious high-rise clouds seen appearing suddenly in the martian atmosphere on a handful of occasions may be linked to space weather.
Hubble sees a swarm of ancient star clusters around a galaxy
Members of a galaxy type that lies somewhere between an elliptical and a spiral galaxy, lenticular galaxies such as NGC 5308 are disk galaxies that have used up, or lost, the majority of their gas and dust.
Study Helps Explain Sea Ice Differences at Earth’s Poles
Why is Antarctic sea ice cover increasing while Arctic sea ice is diminishing rapidly? A NASA-led study finds the geology of Antarctica and the Southern Ocean are responsible.
Watch Galileo launch
Follow the launch of Europe’s 13th and 14 Galileo satellites on Tuesday 24 May, live from 10:28 CEST
Week In Images
Our week through the lens: 16-20 May 2016
Couture in orbit
Clothes for the space age on show at London’s Science museum 25 May, with ESA and leading European fashion schools
Sentinel-1A spots potential oil slick from missing EgyptAir plane

The Sentinel-1A radar satellite has detected a potential oil slick in the eastern Mediterranean Sea – in the same area where EgyptAir flight MS804 disappeared early yesterday morning on its way from Paris to Cairo.
The Sky This Week: May 20 – May 29
Mars is the star of the show this week, but comet fans and a few gas giants will make welcome appearances in the night sky.
European astronomers may have found a new way to find alien planets
New methods could pave the way to finding a true other Earth.
Mission control ready for next Galileo pair
A team of European mission control experts will be watching closely next week when two Galileo satellites are boosted into space, ready to shepherd the craft through the first critical days in orbit.
First evidence of icy comets orbiting a sun-like star
Researchers detected low levels of carbon monoxide gas around the star in amounts that are consistent with the comets in our own solar system.
Sun glitter reveals coastal waves
Sentinel-2A is demonstrating how it can be used to help forecast ocean waves around our coasts: sunlight reflected from the water surface reveals complex waves as they encounter the coastline and seafloor off the tip of Dorre Island, Weste…
Impact chip
Operations image of the week: A debris impact chip in a Space Station window illustrates the risk presented by space debris
Earth from Space

Join us Friday, 20 May, at 10:00 CEST for the ‘Earth from Space’ video programme. This week features a Sentinel-2A image of the Rub’ al Khali desert
German Chancellor at ESA
German Chancellor Angela Merkel was welcomed at the ESA Astronaut Centre by DG Jan Woerner and Alexander Gerst
Astronomers confirm the faintest early galaxy ever detected
The team relied on gravitational lensing to see the incredibly faint object born just after the Big Bang.
Watch Mars in Opposition LIVE With Slooh Observatory
You can follow along with the action here.
Ancient tsunamis pummeled the surface of Mars
Each struck in different eras, leaving behind a breadcrumb trail of clues.
Joint team

Operations Image of the week: Mission controllers gather for next week’s Galileo launch
Making physics connect
The paper ‘Physics in a social context’ (Campbell 2006 Phys. Educ . 41
[http://dx.doi.org/10.1088/0031-9120/41/6/004] 514 [http://dx.doi.org/10.1088/0031-9120/41/6/004] )
argued that school physics educators should teach more than its conceptual …
Computer memories
The paper ‘Computer simulation of electric field lines’ (Kirkup 1985 Phys. Educ . 20
[http://dx.doi.org/10.1088/0031-9120/20/3/314] 142 [http://dx.doi.org/10.1088/0031-9120/20/3/314] )
appeared in 1985 and contains details of a BBC computer progr…
Uranus May Have a Layer That Keeps Its Glow Dim
A ‘blanket’ layer may keep the planet from a faint glow, unlike its neighbor, Neptune.
Alexander Gerst to be Space Station commander
ESA astronaut Alexander Gerst has been assigned a new mission to the International Space Station, where he will fulfil the role of commander during the second part of his six-month mission in 2018.
African mosaic
Images from Sentinel-2A over the last five months have been used to create a remarkable cloud-free view of Africa
Model arrival at Mars

Technology image of the week: this Lego model of Europe’s ExoMars 2020 rover on its lander is a tool, being used by robotics engineers during an ‘egress’ test campaign
Galileo rising
Video briefing on the next Galileo launch on 24 May, including views of the satellites and an interview with ESA’s Navigation Director Paul Verhoef
New Horizons collects first science on a Kuiper Belt object past Pluto
The spacecraft has now twice observed 1994 JR1, a Kuiper Belt object orbiting more than 3 billion miles from the Sun.
Europa’s ocean may have an Earth-like chemical balance
Whether the jovian moon has the raw materials and chemical energy in the right proportions to support biology is a topic of intense scientific interest.
An asymptotical machine
A new and intriguing machine may be obtained replacing the moving pulley of a gun tackle with a
fixed point in the rope. Its most important feature is the asymptotic efficiency. Here we obtain a
satisfactory description of this machine by means of ve…
Europa’s Ocean May Have An Earthlike Chemical Balance
A NASA modeling study suggests the necessary balance of chemical energy for life could exist in the ocean of Jupiter’s moon Europa, even without volcanic hydrothermal activity.
Kepler-223 System: Clues to Planetary Migration
A new study finds a solar system whose planets may resemble the ancient configuration of Jupiter, Saturn, Uranus and Neptune.
Spacewalk to catwalk
ESA and London’s Science Museum are working with leading fashion schools around Europe to design clothes for the space age with Couture in Orbit
Voyage around Earth
Human spaceflight and robotic exploration image of the week: The International Space Station has now circled Earth 100 000 times
Cut crater
Space science image of the week: A fault cuts through an ancient crater on Mars
Clues to ancient giant asteroid found in western Australia
The impact would have triggered earthquakes orders of magnitude greater than terrestrial earthquakes, it would have caused huge tsunamis, and would have made cliffs crumble.”
Dwarf planet Haumea’s lunar system smaller than anticipated
It has two known satellites, an unusually high spin rate, and is also the “parent” of a large family of icy bodies in the outer solar system.
New Study Maps Rate of New Orleans Sinking
New Orleans and surrounding areas continue to sink due to a combination of natural and human-induced processes, finds a new NASA/university study using NASA airborne radar.
Hunting for hidden life on worlds orbiting old red stars
Planetary diversity suggests that around other stars, initially frozen worlds could be the size of Earth and provide habitable conditions once the star becomes older.
Andre Brahic, discoverer of Neptune’s rings, dies at age 73
An expert on the solar system, in 1984 he launched a program that led to the discovery, with US astronomer William Hubbard.
Satellite splat II: an inelastic collision with a surface-launched projectile and the maximum orbital radius for planetary impact
Starting with conservation of energy and angular momentum, we derive a convenient method for
determining the periapsis distance of an orbiting object, by expressing its velocity components in
terms of the local circular speed. This relation is used t…
Quantum and classical probability distributions for arbitrary Hamiltonians
In the limit of large quantum excitations, the classical and quantum probability distributions for a
Schrödinger equation can be compared by using the corresponding WKBJ solutions whose rapid
oscillations are averaged. This result is extended for on…
Energetic photons through water: an undergraduate experiment with correlated γ -rays from 22 Na
Measurements of the speed of light have been carried out in the past by the correlation between
gamma rays detected in two scintillation detectors. To demonstrate that the speed of gamma rays in a
transparent medium is very close to that observed in …
A rigorous and simpler method of image charges
The method of image charges relies on the proven uniqueness of the solution of the Laplace
differential equation for an electrostatic potential which satisfies some specified boundary
conditions. Granted by that uniqueness, the method of images is ri…
Ultrafast (picosecond) laser oscillator for educational use
Here, we present a description of an inexpensive ultrafast self-starting passively mode-locked laser
oscillator that can be constructed using widely available off-the-shelf optical components. Such a
laser system can be used to teach students the pri…
Lattice Boltzmann method and channel flow
Lattice Boltzmann methods are presented at an introductory level with a focus on fairly simple
simulations that can be used to test and illustrate the model’s capabilities. Two scenarios are
presented. The first is a simple laminar flow in a straig…
How a small satellite could reveal big details about Jupiter’s icy moon
A proposal for a Europa CubeSat mission could map the entire world, and maybe find evidence of life too.
Week In Images
Our week through the lens: 9-13 May 2016
Couture in orbit

Together with the London Science Museum and top European fashion schools, ESA is harnessing next-generation technology and exploring the future of fashion
Simulating Tropomi

Presented at this week’s Living Planet Symposium, this image shows how the Sentinel-5P satellite will improve air-quality forecasts
Living Planet 2016
Selected highlights of the Living Planet Symposium in Prague, 9-13 May
Small blue galaxy could shed new light on Big Bang
“Little lion” galaxy contains lowest level of heavy elements ever detected in gravitationally bound system of stars
Methane and carbon dioxide on the rise
Satellite readings show that atmospheric methane and carbon dioxide are continuing to increase despite global efforts to reduce emissions.
Scientists find “birthmarks” from Earth’s infancy
The surviving parts of Earth’s primitive mantle have been preserved for four and a half billion years.
Earth from Space

René Forsberg joins the programme at the Living Planet Symposium in Prague to discuss collecting gravity data at the South Pole to support GOCE
New Limits on Extragalactic Magnetic Fields from Rotation Measures
Author(s): M. S. Pshirkov, P. G. Tinyakov, and F. R. Urban
An analysis of the polarized emission from some 3000 distant radio sources places a stringent upper limit on the strength of the cosmological magnetic field.

[Phys. Rev. Lett. 116, 191302] Published Thu May 12, 2016
Water for crops

By providing information on soil moisture around plant roots, ESA’s SMOS satellite is helping to forecast crop yield and monitor drought
Earth from Space
Noel Gourmelen joins the programme at the Living Planet Symposium in Prague to discuss a new way of processing CryoSat data over ice sheets
Lunar ice drill

Technology image of the week: this ice drill has been designed to penetrate 1–2 m into the surface of the Moon
Second cycle of martian seasons completing for Curiosity rover
The repetition helps distinguish seasonal effects from sporadic events.
New analysis shows no long-term dimming around “alien megastructure” star
Tabby’s star is still pretty weird, but at least one part of the mystery was a false lead.
The rise and fall of martian lakes
The size, evolution, and duration of standing bodies of water, such as lakes, on Mars’ surface are still a matter of great debate.
This map shows where in the sky you might find habitable exoplanets
There are 42 worlds that might be Earth-like out there. We can’t see them directly, yet. But here’s where to find out cosmic cousins.
Astronomers find a system of planets that keep each other in the tightest formation seen
With each planet in resonance, there’s little room to move for the four planets around Kepler-223.
Second Cycle of Martian Seasons Completing for Curiosity Rover
NASA’s Curiosity Mars rover has completed its second Martian year since landing in 2012, recording environmental patterns through two full cycles of Martian seasons.
2007 OR10: Largest Unnamed World in the Solar System
New results from NASA’s Kepler/K2 mission reveal the largest unnamed body in our solar system and the third largest of the current roster of dwarf planets.
From petabytes to pictures
Thousands of scientists are at the Living Planet Symposium in Prague this week to present the latest findings on our changing planet. Between the mountains of data coming from multiple satellites and the high level of expertise needed to t…
The eye of Saturn’s storm

Space science image of the week: Saturn’s monstrous south pole vortex is a hurricane-like structure almost two thirds the diameter of Earth
Dynamic peninsula
Presented at the Living Planet Symposium, this map uses radar images from Sentinel-1A to show that Antarctic Peninsula ice flows up to a metre per day
2007 OR10: Largest unnamed world in the solar system
Astronomers combined data from two space observatories to reveal something surprising: This dwarf planet is significantly larger than previously thought.
Metal content in early galaxies challenges star-forming theory
Scientists found typical galaxies forming stars in the universe two billion years after the Big Bang have only twenty percent of metals compared with those in the present day universe.
NASA-Mentored Teams Win Robotics Championship
Two teams mentored by NASA centers were in the winning alliance at the national FIRST Championship in St. Louis on April 30.
NASA’s Kepler Mission Announces Largest Collection of Planets Ever Discovered
NASA’s Kepler mission has verified 1,284 new planets — the single largest finding of planets to date.
Vacuum test
ESA astronaut Thomas Pesquet tries out a spacesuit
<i>Helicobacter pylori</i> Couples Motility and Diffusion to Actively Create a Heterogeneous Complex Medium in Gastric Mucus
Author(s): Seyed Amir Mirbagheri and Henry Chien FuResearchers calculate the size of a low-resistance buffer zone created by microbial organisms as they swim through the mucus lining of the stomach.[Phys. Rev. Lett. 116, 198101] Published Tue May 10, 2016
Earth’s magnetic heartbeat

With more than two years of measurements by ESA’s Swarm satellite trio, changes in the strength of Earth’s magnetic field are being mapped in detail.
Galileo satellites fuelled for flight

Europe’s latest Galileo satellites have been filled with fuel in preparation for their joint launch on a Soyuz rocket from Europe’s Spaceport in French Guiana on 24 May.
Transit of Mercury

As the smallest planet in the Solar System crossed the fiery face of the Sun on Monday 9 May, one of ESA’s smallest satellites was watching
The Kepler mission just doubled its catalog of exoplanet finds
Meet your 1,200 new exoplanet neighbors.
Flying observatory detects atomic oxygen in martian atmosphere
These atoms were found in the upper layers of the martian atmosphere known as the mesosphere.
Earth from Space

Wolfram Mauser, Chairman of the Earth Science Advisory Committee, joins us at the Living Planet Symposium in Prague to discuss some of the highlights from ESA’s Earth Explorer missions
Spotlight on our living planet
One of the biggest Earth observation conferences in the world got off to a flying start today as thousands of scientists from around the world gathered in the Czech Republic to present their latest findings on our changing planet.