Space Weathering on Asteroids as Reason for their Disintegration
All surfaces of rocky bodies in our planetary system are exposed to a certain bombardment of (tiny) bits of rocks, so-called meteorites. Most ejecta out of these impacts are falling back to the lunar surface to build a layer of dust with time called regolith. Since that we have seen the nice footprints of astronauts in the lunar dust as proof: The Moon`s gravity is strong enough to capture a good part of the ejecta.
Metallic asteroids: threat or benefit?
«Our results suggest a higher number of metallic objects in the Solar System than previously suspected» said Alan Harris from the DLR Institute of Planetary Research in Berlin. Thanks to the new infrared method will be possible to identify many other metal-rich asteroids. What surprised the scientists was that metallic asteroids emit less thermal radiation than rocky asteroids when analyzed by an infrared telescope. Alan Harris and Line Drube using the principle of thermal conductivity
NEOShield’s target object comes close to Earth
Figure 1: Plot of the orbits of all presently known Potentially Hazardous Asteroids (PHAs), i.e. over 1400 as of early 2013. PHAs are asteroids with a size of at least 140 m and with orbits passing the Earth orbit within 7.5 million kilometres. The Earth orbit is shown by a bold black nearly circular ellipse. (Image: NASA/JPL - Caltech) Several possibilities exist to deflect a NEO such as to mitigate its impact risk. The focus
The lander Philae was reactivated
At 11:35 GMT on March 28, 2014 Rosetta´s lander Philae sent a signal towards the Earth confirming its awakening. Philae has been realized with the purpose to send back high-resolution pictures of the comet 67P/Churyumov-Gerasimenko where the lander will land by the end of the year. Presently, scientists don´t know anything about the geology of the comet, therefore, Philae will analyze the 67P/CG composition. The Rosetta´s lander is outfitted with solar cells to recharge its