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How many people have been sent into space?
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566
0%
765
0%
460
0%
290
Explanation
A total of 566 people from 41 countries have gone into space. 12 of them walked on the moon. By the way, a full NASA space suit costs $12,000,000.
What two major gases make up the sun?
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Hydrogen and Helium
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Carbon and Nitrogen
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Neon and Argon
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hydrogen and Carbon
Explanation
The sun, like other stars, is a ball of gas. It is made of 91.0% hydrogen and 8.9% helium. The sun's core is about 2500 times hotter than its surface. The sun's temperature is 9,941°F, which is equal to 5,505 °C.
Which of these is a natural satellite?
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Moon
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Asteroid
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Comet
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Shooting star
Explanation
A satellite is a star or other object that orbits around a larger object. Jupiter is so massive that it has 79 moons.
What is the planet with the coldest average temperature in the solar system?
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Neptune
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Uranus
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Pluto
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Earth
Explanation
Neptune has the coldest overall average temperature, and Uranus has the coldest temperature ever recorded. Pluto is categorized as a dwarf planet and not a regular planet since it is much smaller, but Pluto was the planet furthest away from the sun and also the coldest.
Which planet has one-third of its surface covered by water?
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Pluto
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Uranus
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Saturn
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Jupiter
Explanation
Pluto has way more frozen water than scientists initially thought. It was discovered on February 18th, 1930.
What is a light-year?
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The distance covered by light in a year
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How long it takes a beam of light to cover a certain distance in a year
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The product of lightspeed and a spaceship engine's power
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The distance a spaceship travels in a year
Explanation
A light-year is a unit of distance the light travels in one human year. The calculation is as follow: multiply the number of seconds in one year by the distance that light travels in one second (186,282 miles or 299,792 km). The result: one light-year is about 5.88 trillion miles (9.5 trillion km).
Where is the asteroid belt located?
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Between Mars and Jupiter
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Between Uranus and Neptune
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Between Mercury and Venus
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Between Jupiter and Saturn
Explanation
Asteroids are pieces of rock and debris believed to be from long, destroyed planets.
Which of these planets has an 88-day long year?
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Mercury
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Pluto
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Venus
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Uranus
Explanation
Mercury is the nearest planet to the sun and the most cratered planet in the solar system. It's also the smallest planet in our solar system. Mercury has an orbital period of 88 days.
What is the hottest planet in the solar system?
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Venus
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Mercury
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Neptune
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Mars
Explanation
It takes Venus longer to turn once on its axis than to complete one orbit (cycle) of the sun. Meaning a day on Venus is longer than one year on earth.
How many days does it take Mars to complete one revolution around the sun?
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686.93 Earth days
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1007.2 Earth days
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543.78 Earth days
0%
296.5 Earth days
Explanation
Mars is slower and more distant from the Sun. Thus, a full circuit takes 687 Earth days (which is one Mars year). The tallest mountain in the solar system is located on mars.
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