A team of British scientists and engineers are taking a look at gravity as one way to protect the Earth from asteroids and objects from outer space.
Instead of sending shuttle crews to blow an approaching asteroid up, British astronomers at the Astrophysics Research Center are planning to build a 10-ton "gravity tractor" spacecraft that will influence the object's trajectory. However the process will take some time -- a craft will have to be launched 15 years in advance to really have an effect -- but, once the tractor arrives, it will hover close by an asteroid and gently guide it along a different path.
But the high cost implications mean that before the device could be made, it would have to be commissioned by a government or a group of governments working together.
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Color photographs appeared in the middle of the XIX century but were available only to a very narrow privileged circle of people. Therefore, it is normal if the family stores black and white photographs of relatives of those years. Many even like to review them again and again as old cards can awaken special feelings and memories, transfer through time. Read more
Search Engine Optimization or SEO is the process of optimizing websites in order to achieve better results and higher ranks in search engine results. Search engines like Google, Yahoo and Bing depend on certain algorithms that help rank websites according to the way they have been optimized for readers and viewers. Read more