الصف :الثاني عشر - العام الدراسي :2016/2017
By the beginning of 20th century; many things have changed and many theories has achieved.
In addition to that scientist try every day to make travelling in the space available to people by inventing new methods and ways to carry them out.
In one experiment of that scientists tried to make solar spacecrafts which need solar radiation to move into the space.
So we will take a look about these spacecrafts and how they were made? what techniques do they use? For which mission do they work? And what’s the future of these spacecrafts.
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حلقة بحث95Light sail
