The moon will soon have a companion in Earth's orbit for a limited time. An Arjuna asteroid will become a "mini-moon" event for nearly two months starting Sept. 29, according to a study published in ...
On 11 November at 10:30 UTC, close to the 331st apogee, SMART-1 will be in the middle of a “weak stability boundary”. In this region the spacecraft is neither in an Earth-bound orbit, nor a Moon-bound ...
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