Rivals to send spacecraft to the red planet just days apart, as China seeks to challenge the U.S. on exploration
SHANGHAIThe rivalry between the U.S. and China assumes cosmic proportions this month, as both countries prepare to send spacecraft to Mars within days of each other.
The head-to-head Mars missions are the latest sign that China is ready to challenge the U.S. in space exploration, in recent decades an American preserve.
Chinas first mission…