The Cosmic Caboose

Three space craft are expected to land on Mars within a week.  One from the United Arab Emirates, one from China and finally, one from the US of A, called the cosmic caboose.  The reason there’s a traffic jam on Mars is because they all launched last July when the Earth-to-Mars launch window opened, which only occurs every two years.

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3 spacecraft carrying robotic explorers to arrive on Mars less than 2 weeks apart – National | Globalnews.ca