The first two weeks of the horizons mission

Sunrise - seen from the ISS, photographed by Alexander Gerst during the horizons mission.

The 'horizons' mission has been underway for almost two weeks. Alexander Gerst arrived safely at the ISS on 8 June 2018. He gave his first press conference from an altitude of 400 kilometres on 12 June and assisted in an extravehicular activity on 14 June. The 42-year-old German ESA astronaut is now working on scientific experiments in the European Columbus laboratory. The DLR 'horizons' Mission Manager, Volker Schmid, looks back on two eventful weeks. read more

Hayabusa2 and MASCOT lander nearing Ryugu

Hayabusa2, JAXA's asteroid explorer, and the MASCOT lander, developed by the German Aerospace Center (DLR) and the French space agency (CNES) have been travelling through space since December 2014.

They are finally closing in on their destination asteroid – Ryugu. As of 14 June 2018, the distance between Hayabusa2 and Ryugu is less than 770 kilometres and the closing speed is 2.1 metres per second. read more

SOFIA's 'open-heart surgery'

A rare sight – the view from inside SOFIA's telescope chamber, looking out through the telescope door opening into the Lufthansa Technik hangar

SOFIA's heart is really sensitive, which is why the doors to it are usually only opened when she is on 'Cloud 9'. At altitudes in excess of 12 kilometres, the air is very clean and there is no danger that the mirror inside SOFIA will become dirty. Any maintenance on the mirror – a thorough cleaning or its installation or removal – brings with it a high risk of damage.

At the heart of the joint NASA and DLR airborne observatory, SOFIA, is a 2.7-metre, 800-kilogram primary mirror made of fragile glass – a custom-made reflector for which there is no replacement. This is why it is only ever handled with 'velvet gloves' and treated like the princess from the fairy tale 'The Princess and the Pea'. Should the mirror break, it would be the end of SOFIA.

Yet the telescope doors have been opened on the ground? read more

SOFIA, the two-fold stargazer

I have worked in the Space Science Department at the DLR Space Administration since October 2016. I could not imagine a better job than my own as SOFIA project engineer. I tend to commute between Bonn and California quite regularly as the NASA/DLR airborne observatory has its home base in Palmdale. But for around a month now, I have been in Hamburg with SOFIA.

Like any other aircraft, this one – registered as N747NA and named the Clipper Lindbergh – requires regular maintenance. This is no ordinary aircraft, though, as the Clipper Lindbergh is just one of 45 special variants of the classic Boeing 747 that were ever built: a so-called 747SP (special performance). Fewer than eight of these 'old timers' remain in service today. What is more, the Clipper Lindberg was modified to make space for the SOFIA telescope, which weighs 'just' 17 tons. So we are dealing with quite a few special features all at once. That is why inspections for its next certification are now on the agenda, and they are far more detailed than those for normal airliners or cars. read more

Why does SOFIA have a bulge?

SOFIA at German Aerospace Day in Cologne

You could say that SOFIA is the aircraft equivalent of the hunchback of Notredame, as unlike its elegant colleagues that we know and appreciate from normal air transport, our observatory has a hunch, or a bulge. Does that make SOFIA unattractive? Perhaps! But I believe that it is the bulge that makes the aircraft so interesting, as it hides SOFIA’s inner treasure: the telescope, the star trackers and last but not least the door system as well – with all the integral components. read more

Larsen C – A giant in motion

Displacement of the iceberg at the Larsen-C ice shelf between July and October 2017

The A68 iceberg has been making headlines again after calving from the Larsen-C in July 2017. What happened? It moved and shrunk minimally. And while that may not be unusual, it is still worth a blog post.

Close examination of satellite image sequences from the last two months reveals the striking events unfolding there. Remember, the 5800 square kilometre iceberg is seven times the size of Berlin and is permanently moving. The iceberg has collided repeatedly with the ice shelf, dislodging smaller pieces of ice. read more

Beaming instructions from space: robot experiment between the ISS and Oberpfaffenhofen

Rollin 'Justin and the solar panels he will inspect during the SUPVIS Justin experiment.

The Institute of Robotics and Mechatronics at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) has long been a forerunner in the remote control of robot technology for space applications. In 1993, the ROTEX experiment was the first ever in which a robot was remotely controlled from the ground and actually caught a free-floating object in space. In a more recent experiment in December 2015, cosmonaut Sergei Volkov used technology that built on this experiment to operate a ground-based robot from the International Space Station (ISS). At the time, a finely-tuned joystick allowed the cosmonaut to shake hands with institute director Alin Albu-Schäffer and even raise a glass on the success of the Kontur-2 mission. read more

Larsen C - TerraSAR-X observes calving of A-68 iceberg

After detaching: TSX-ScanSAR image from Saturday, 22 July 2017, 23:40 UTC

In recent days, the gigantic iceberg that has broken free of the Larsen C ice shelf on the Antarctic Peninsula has been in the headlines. Although the dislodging of icebergs from ice shelves is a natural occurrence and does indeed take place regularly in the Antarctic, as the media aptly reported, this event made a far larger impression than many others. Why is that? Probably because scientists have been using satellite data for months now to observe this region of the Antarctic in greater detail and have effectively been waiting for the event to occur. Moreover, the section of ice that dislodged this time is comparatively large, approximately seven times the size of Berlin. read more

ROBEX Part 4: Ash, beetles and blustering winds

Dust is inescapable after four weeks of field research on Mount Etna: a tenaciously fine layer covers everything: equipment, transport crates and notebook keypads. It penetrates the mission container and sticks to hands and legs lathered in sunscreen. Every step in the black lava soil kicks up clouds of dust. Even the white body of the LRU-2 Rover is coated in black deposits. A small mercy is that the last few days have seen significantly fewer flies and beetles buzzing around Mount Etna who, despite the gaunt landscape, insistently settle on the jackets and hats of the ROBEX team members.

After all, Mount Etna is not a conventional laboratory and remains unpredictable. Gusts of wind up to 100 kilometres an hour pummel the mountain on Thursday, carrying with it not only dust but heavy rocks, putting a stop to any work with the Rover – the force of the wind against the Rover's body and arm would simply be too great and could well have damaged it. The lander is also packed away safely, the flaps on its charging port not just folded down, but securely strapped in place. Finally, the engineers face the battering wind to remove the signs on the lander that the Rover uses as points of orientation during its approach. read more

ROBEX Part 3: Hammering for science

Mount Etna is very close to being a substitute Moon for the planetary researchers of the ROBEX project – it is here that they find volcanic basalt in quantities similar to those of the constituents of the lunar soil. In addition, the Sicilian volcano is the only place in Europe that experiences earthquakes at a depth of up to 600 kilometres. Mount Etna is like the Moon in this respect as well, as Earth's lunar companion experiences most earthquakes 700 to 1100 kilometres below the surface. "Etna is the only place in Europe where we can measure earthquakes at a similar depth," says planetary researcher Martin Knapmeyer.

Two experiments are to be conducted on the mountain; in the active measurements, the scientists use a hammer to strike the surface and seismometers to measure the transmission of the sound waves through the ground. The volcanic ash of 2001 rests on top of a more solid layer in Piano del Lago, so waves that take different routes through the surface material arrive at the seismometers at different times, providing information on the structures below the ground. The passive experiment uses four measurement stations to listen to the processes inside the volcano. read more