In what year did the United States purchase Alaska from Russia? Answer with the four-digit year only.
In what year did Theodore Maiman demonstrate the first working laser? Answer with the four-digit year only.
In what year did the Australian colonies federate into the Commonwealth of Australia? Answer with the four-digit year only.
Which dwarf planet is the largest object in the asteroid belt? Answer with the name only.
How many time zones span the contiguous United States? Answer with the whole number only.
Which airline alliance does British Airways belong to? Answer with the alliance's full name.
In what year was the Hubble Space Telescope launched? Answer with the four-digit year only.
Who led the team that built Chicago Pile-1, the first nuclear reactor? Answer with the surname only.
What is the two-character IATA code of Qatar Airways? Answer with the two-character code only.
What is the two-character IATA code of China Eastern Airlines? Answer with the two-character code only.
Mercury has at least one natural moon. Answer true or false.
In what year did the Airbus A380 enter commercial service? Answer with the four-digit year only.
In what year did Amelia Earhart disappear over the Pacific? Answer with the four-digit year only.
The Moon has a thick atmosphere. Answer true or false.
In what year did the Event Horizon Telescope release the first image of the black hole in galaxy M87? Answer with the four-digit year only.
Which astronomer formulated the three laws of planetary motion? Answer with the surname only.
Which planet is closest to the Sun? Answer with the name only.
Istanbul is the capital of Turkey. Answer true or false.
In what year did Michael Faraday discover electromagnetic induction? Answer with the four-digit year only.
In what year did the Airbus A350 enter commercial service? Answer with the four-digit year only.
