* Astronomy

NASA is carefully tracking some 500 pieces of debris from a Russian intelligence satellite that may pose a hazard for the international space station. The satellite exploded in March; another piece of it broke apart in June.

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EORSATS (Elint Ocean Reconnaissance Satellite) are typically deployed at 65.0 degrees inclination and  at altitudes of about 405 to 420 kilometres and are relatively short lived (6 months).