Ballpark #5 · Wednesday, November 4, 2026

The Pantheon in Rome, a full UK pint and more

The Wednesday, November 4, 2026 puzzle: five questions, each with a number for an answer. How close can you get?

How wide is the dome of the Pantheon in Rome, measured across its inside?Interior diameter of the rotunda, in metres
How much beer is in a full UK pint?Imperial pint, in millilitres
How old is the universe?Best current estimate, in billions of years
About how many neurons are in an adult human brain, in billions?Nerve cells only, not supporting cells
At what altitude above the equator does a satellite hover over one spot on Earth?Geostationary orbit

218 players finished Ballpark #5. Average score: 447 of 1,000; 1% scored 800 or more.

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Show answers

🏛️ How wide is the dome of the Pantheon in Rome, measured across its inside?about 43 m
Almost 2,000 years after it was built, it is still the world's largest unreinforced concrete dome, with no steel inside.
Sources: en.wikipedia.org · worldhistory.org
🍺 How much beer is in a full UK pint?568 ml
The UK pint is an eighth of an imperial gallon; the US pint is an eighth of the smaller US gallon, so it holds only about 473 ml.
Sources: en.wikipedia.org · news.stv.tv
🌌 How old is the universe?13.8 billion years
Light from the cosmic microwave background left when the universe was only about 380,000 years old.
Sources: science.nasa.gov · en.wikipedia.org
🧠 About how many neurons are in an adult human brain, in billions?86 billion
The old textbook figure was 100 billion; a 2009 count that dissolved brains into cell-nucleus soup found 86 billion.
Sources: en.wikipedia.org · pubmed.ncbi.nlm.nih.gov
🛰️ At what altitude above the equator does a satellite hover over one spot on Earth?35,786 km
A satellite there circles in step with Earth's spin, so it seems to hang motionless in the sky.
Sources: en.wikipedia.org · nesdis.noaa.gov