a) April 10th
b) April 12thÂ
c) April 14th
d) April 11th
The International Day of Human Space Flight 2020 was observed on April 12, 2020. The day is observed to commemorate the beginning of space era for humankind. The marks the date if the first human space flight, which was carried out by Yuri Gagarin, first human being to journey into outer space.