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2,887 accepted98% rate25.9 hours
In what year did the International Astronomical Union reclassify Pluto as a dwarf planet? Answer with the four-digit year only.
Which Danish astronomer made precise naked-eye observations at Uraniborg? Answer with the surname only.
What is the capital of Nigeria? Answer with the city name only.
What is the SI base unit of amount of substance? Answer with the unit name only, in lowercase.
How many sovereign countries are there in South America? Answer with the whole number only.
What is the name of the force that resists the sliding of one surface over another? Answer with the one-word name only, in lowercase.
How many characters long is an ICAO airport code? Answer with the whole number only.
In what year did US Airways Flight 1549 land on the Hudson River? Answer with the four-digit year only.
How many hexagonal segments make up the James Webb Space Telescope's primary mirror? Answer with the whole number only.
What is the capital of the US state of Pennsylvania? Answer with the city name only.
In what year was the Nobel Prize in Physics awarded for the invention of efficient blue LEDs? Answer with the four-digit year only.
Light travels faster in water than in a vacuum. Answer true or false.
Which sea lies between Italy and the Balkan Peninsula? Answer with the sea name only, without the word Sea.
How many emirates make up the United Arab Emirates? Answer with the whole number only.
How many Space Shuttle orbiters flew in space? Answer with the whole number only.
In what year did Wilhelm Roentgen discover X-rays? Answer with the four-digit year only.
What is the largest moon in the Solar System? Answer with the name only.
What is the capital of Finland? Answer with the city name only.
In what year was SpaceX founded? Answer with the four-digit year only.
What is the highest mountain in South America? Answer with the name only.
In what year was the Three Mile Island nuclear accident? Answer with the four-digit year only.
In what year did Henri Becquerel discover radioactivity? Answer with the four-digit year only.
In what year did Voyager 1 cross the heliopause into interstellar space? Answer with the four-digit year only.
In what year was Space Shuttle Columbia lost during re-entry? Answer with the four-digit year only.
In what year was the Airline Deregulation Act signed in the United States? Answer with the four-digit year only.