From the first human launch in a hot air balloon in 1783, to the successful launch of the first artificial earth satellite by the Soviet Union in 1957, and then to the US Pioneer 10 probe flying out of the solar system in 1986, human beings have taken three gratifying steps into the sky.
Reader comments
War of the Worlds! We need support from all sides! Creation is unobstructed! Done in one go! The top of speed! Disasters cannot be avoided! Control everything and kill all relationships instantly! Complex. Made easy! Relaxing and calm!
This book is very rich in content. After reading it, I gained a lot of knowledge! In particular, the launch direction of artificial satellites mentioned in it turns out to be because the inertia of the earth can be used to save fuel and thrust. The book also explains the impact of the latitude of the launch site on the thrust required by the rocket, which is very interesting. However, I don't like some of the scientific terms in the book, and it's a bit difficult to read. Overall, this is a science and technology book worth reading.
Beautiful, I like it very much
So much knowledge! China is really great!
Very good, I like you
Super pretty, super awesome
Relatively fast relatively fast
Good very good time
The world is so big and full of wonders.
Learn new technologies. Broaden horizons, admit backwardness, new ideas
It looks good and worth recommending. Thank you.
It sounds good, really informative, useful, great
Not bad, good, good-looking. I love watching it. Very good-looking.
War of the Worlds! We need support from all sides! Creation is unobstructed! Done in one go! The top of speed! Disasters cannot be avoided! Control everything and kill all relationships instantly! Complex. Made easy! Relaxing and calm!
This book is very rich in content. After reading it, I gained a lot of knowledge! In particular, the launch direction of artificial satellites mentioned in it turns out to be because the inertia of the earth can be used to save fuel and thrust. The book also explains the impact of the latitude of the launch site on the thrust required by the rocket, which is very interesting. However, I don't like some of the scientific terms in the book, and it's a bit difficult to read. Overall, this is a science and technology book worth reading.
Beautiful, I like it very much
So much knowledge! China is really great!
Very good, I like you
Super pretty, super awesome
Relatively fast relatively fast
Good very good time
The world is so big and full of wonders.
Learn new technologies. Broaden horizons, admit backwardness, new ideas
It looks good and worth recommending. Thank you.
It sounds good, really informative, useful, great
Not bad, good, good-looking. I love watching it. Very good-looking.