Mars will be the closest it has been in more than a decade this week, coming close enough for "exceptional viewing" even by the naked eye.
In a rare occurrence that only takes places once or twice every 15-17 years, Mars and Earth will reach the point in their elliptical orbits that means they are the closest possible distance from each other on their current orbits, known as "close approach".
The celestial event started yesterday night (May 22) and means the planet will...
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