Ballpark #20 — answers
August 14, 2026 · five estimation questions and their accepted values
Question 1
How close does Mars get to Earth at closest approach, in millions of kilometers?
54.6
Theoretical closest approach.
Question 2
How long is an NBA basketball court, in meters?
28.65
Question 3
How long are all the blood vessels in one human body, laid end to end, in kilometers?
100000
The classic textbook estimate.
Question 4
How much does the Liberty Bell weigh, in kilograms?
943
Question 5
How many calories are in a Big Mac?
590
US menu figure.
▶ Play today's Ballpark
Five new "how many?" questions every day. No signup.