7.6K views · 518 reactions | 2020 is called the year of Mars as there are three missions poised to launch toward the red planet, including NASA's Perseverance, the United Arab Emirates' first-ever interplanetary Hope Mars mission, and China's first Mars exploration mission-Tianwen 1. But have you ever considered why the launch windows for all the three missions have been set from mid-July to mid-August? Why can't they launch their spacecraft in other months? | CGTN | Facebook