Ballpark #39 — answers
September 2, 2026 · five estimation questions and their accepted values
Question 1
How hot is the surface of the Sun, in Celsius?
5500
The photosphere; the core is millions of degrees.
Question 2
How many Earth years does Neptune take to orbit the Sun?
165
Question 3
How many people can ride the London Eye at once?
800
32 capsules holding 25 people each.
Question 4
How many muscle units are in an elephant’s trunk?
40000
Commonly cited as about 40,000.
Question 5
How many hours a day does a koala sleep?
20
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