In this photo you can see the greenish coma and told of comet siding spring. This comet is 2000 light years away and is is the messier 6 cluster. In the picture they seem very close together. They are in the same line of sight as the constellation named Scorpius. One of the constellation we have learned this year already. The comet will be just passing mars by 139,500 km. Thats is almost 10 times closer that any know comet to by earth to this day. If it were to impact it would have no direct effect on us other than the comet dust moving 56km per second. The encounter will be followed closely by the spacecraft and martian orbit and rovers.
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