According to Douglas Adams, in his famous book The Hitch-Hikers Guide to the Galaxy, space is big. However, it seems near-Earth space is not big enough. In December 2001, the Space Shuttle pushed the International Space Station away from a discarded Russian rocket booster that was due to pass uncomfortably close. Space litter is a growing problem but smarter satellite design may help in the future.
From the beginning of the space era, satellites and deep-space probes have populated the Solar System. There are now a huge number of satellites orbiting the Earth, for different purposes including Earth observation, weather forecasting, telecommunications, military applications, and astronomy. The space around Earth is therefore becoming more and more crowded. Aside from the aspect of `space traffic control`, there is the question of what to do with space litter.
ESA`s European Space Operations Centre (ESOC) in Darmstadt, Germany, tracks space litter. It estimates that over 23 000 objects larger than 10 centimetres have been launched from Earth. Of these, about 7500 are still orbiting - only a very small proportion of them (6%) is operational. Half of all the objects are inoperable satellites, spent rocket stages, or other large space litter; the remaining 44% is debris from explosions and accidents in space. To make things worse, there are an estimated 70 000 to 120 000 fragments smaller than 1 centimetre and the amount of space debris increases by about 5% every year.
Monica Talevi | alfa
Gamma rays will reach beyond the limits of light
23.10.2017 | Chalmers University of Technology
Creation of coherent states in molecules by incoherent electrons
23.10.2017 | Tata Institute of Fundamental Research
Salmonellae are dangerous pathogens that enter the body via contaminated food and can cause severe infections. But these bacteria are also known to target...
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
23.10.2017 | Event News
17.10.2017 | Event News
10.10.2017 | Event News
24.10.2017 | Life Sciences
23.10.2017 | Life Sciences
23.10.2017 | Physics and Astronomy