Ballpark — September 25, 2026
Answers to that day's 5 daily estimation questions.
How many Earth years does it take Neptune to complete one orbit of the Sun?
165 years
Neptune orbits nearly 2.8 billion miles from the Sun, moving far slower than Earth.
How long is the Panama Canal, from deep water in the Atlantic to deep water in the Pacific, in miles?
~50 miles
A ship transiting the canal is raised and lowered nearly 85 feet through a series of locks along the way.
How long is the Channel Tunnel connecting England and France, in miles?
32 miles
Trains cross beneath the English Channel in about 35 minutes.
How long is the Trans-Alaska Pipeline, carrying oil from Prudhoe Bay to Valdez, in miles?
800 miles
The pipeline was built elevated on supports for much of its route to withstand Alaska's earthquakes and permafrost.
How many people live per square mile in Manhattan?
~74,775 people per sq mile
On weekdays, Manhattan's daytime population swells to nearly 4 million with commuters.