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