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Please fill in the blanks: When a rocket is launched, it ejects a large amount of gases_____. This generates a thrust that pushes the rocket_____.
downwards, upwards
What does space lacks?
Air, gravity and water
What did people invent to observe space?
Large-scale telescopes, radio telescopes and space telescopes
What can we see when we go stargazing?
Auroras Meteor Showers Comets
When did a probe of Former Soviet Union reach Venus?
1975
When did the Former Soviet Union launch the first artifical satellite?
1957
When was NASA established?
1958
In 1961, who became the first astronaut in history?
Yuri Gagarin from Soviet Union
In which year, astronauts from United States reached the Moon for the first time.
1969
Who is the first astronaut to go on space?
Yang Liwei
How many Solar eclipses are there? What are they?
3, partial solar eclipse, total solar eclipse and annular solar eclipse
How many Lunar eclipses are there? What are they?
2, total lunar eclipse and partial Lunar eclipse
What makes Earth suitable for human beings to live on?
Atmoepheric protection, sufficient water, stable gasous ratio and nutrients for plants in the soil
What does revolution cause?
Different seasons
The Earth's axis is tilted. How many degrees does it tilt to the right?
23.5
How many days does a cycle of revolution requires?
365.25days
Which planet has the largest number of halos? Are they obvious?
Uranus, Not obvious
Fill in the blanks: The ______ in Neptune's atmosphere is part of what makes it look blue.
methane
The Earth's axis go through where?
North Pole and South Pole
What does Earth spins around?
An imaginary axis
What is the spinning of Earth called?
rotation
What is the rotation time for each cycle?
A day
How many time zones are there?
24
What is called a revolution?
It is the movement that Earth moves around Sun
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