Definitions: What is measured by a chronometer?

Questions

1 followed by 42 zeroes?

the biggest bell is the ____________, cast in the kremlin in 1733. it weighs 216 tons, but alas, it is cracked and has never been rung?

how many ways are there to make change for a dollar?

in 1964 rhodesia declared udi, what is 'udi'?

what is the 'big bang' said to have created?