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1. The number of...
55 aliens vs. 64 squares.
Squares in chess
Enemy ships in Space Invaders (original arcade game)
2. The land area of...
The Qing had ~14,700,000km², Yuan had ~11,000,000km², the PRC controls 9,706,961km², the Ming had ~6,500,000km², and no, including the PRC's disputed lands changes nothing about the order.
People's Republic of China (2023)
Great Ming (1450)
Great Qing (1790)
Great Yuan (1310)
3. The height of...
Everest, K2 and Kangchenjunga sum to 26,046m, while Olympus Mons is roughly 21,600m.
Olympus Mons
The Earth's three tallest mountains combined
4. The value of...
Each begins with a different integer part - the golden ratio, ϕ, begins with 1, Euler's number, e, 2, and pi, π, 3.
π
e
ϕ
5. The length of...
The TSR covers 9,289km, while the Nile only gets to 6,650km. Even adding the length of the Blue Nile isn't enough.
The Nile River
The Trans-Siberian Railway
6. The number of...
11 planks (oak, spruce, birch, jungle, acacia, dark oak, mangrove, cherry, bamboo, crimson and warped) to 10 mobs (allay, bat, bee, blaze, Ender Dragon, ghast, parrot, phantom, vex, and Wither).
Unique flying mobs in Minecraft (as of 1.19)
Plank types in Minecraft (as of 1.19)
7. The population of...
Fitting, really. In order, it's Paris (24,171), Montpelier (8,074), Marseilles (4,845), Lyons (4,367).
Montpelier, Vermont
Lyons, Georgia
Marseilles, Illinois
Paris, Texas
8. Days since...
Essentially which happened first of these 1969 aerospace events - 747 flew on 9th February, Concorde on 2nd March, Apollo 10 on 18th May,
The Boeing 747's first flight
Apollo 10's launch
The Concorde's first flight
9. The number of...
Morocco-Spain has 3 sections (Ceuta, Melilla, and Peñón de Vélez de la Gomera). The rest have 2.
Distinct sections of the China-Russia border
Distinct sections of the Morocco-Spain border
Distinct sections of the Brunei-Malaysia border
Distinct sections of the Azerbaijan-Iran border
10. The length of...
The Long 18th Century lasted 127 years, the Long 19th Century lasted 125 years, the Hundred Years' War lasted 116 years, and the Shi'a Century lasted 110 years