Chelyabinsk: one year later
The best estimate for the mass of the object is accepted to be around 10.000 tons. The object entered our atmosphere at an incredible speed of 19 km/s releasing about 500 kilotons of energy. It is classified as an ordinary chondrite of the type LL5. After the explosion most of the object became dust. Only small fragments made it to the ground. First studies of material samples found suggest the age of the object to
Collision in our planetary system: it started with an event on Jupiter
The direct observation of impacts in our planetary system started in 1994 when astronomers could directly observe the impacts of cometary fragments on Jupiter: the newly discovered comet Shoemaker-Levi was caught by the large gravitational field of Jupiter. First its orbit was changed. Later Jupiter´s gravitational forces became larger than the inner stability of the comet which resulted in a break-up of the comet. Since that a planetary pearl necklace approach Jupiter and finally impacted.
Recent collision in our planetary system:about recent cratering on Mars
A relatively large crater was suddenly detected by the NASA Mars Reconnaissance Orbiter (MRO) on the surface of Mars. This exciting discovery was made by the High Resolution Imaging Science Experiment HIRISE which saw for the first time an about 30 m diameter crater in the center of a colorful radial burst pattern. This crater appeared obviously in the time between July 2010 and May 2012. Based on apparent changes between those before-and-after images at
Rosetta wake-up: “Year of the Comet” Successfully Opened
Introductory remark. At the end of November 2013 we have had some sort of Cometary Festival: Five relatively bright comets were on the early morning sky – more than ever. One of these objects, the comet Lovejoy, was caught with the help of my self-made telescope in the early morning of November 27, 2013. Comet Lovejoy in the morning of November 27, 2013 photographed with the help of a self-made Telescope (Image: N. Pailer) With