discussing the count of a large number of objects, such as stars in the Observable Universe, the focus is not on calculating their literal quantity down to the last star. In such cases, understanding the order of magnitude is sufficient. It is considered that the number of stars in the Observable Universe is a figure with 22 digits, which is more conveniently represented as one followed by 21 zeros and written as 10 to the power of 21.

Moreover, this is a lower estimate. This means that there could be

as few as

or as many as

1 000 000 000 000 000 000 000,

9 999 999 999 999 999 999 999

A million billion. That's the total number of ants on the planet. Inside the human body, there are approximately 1 quadrillion bacteria, and their total weight is around 2 kilograms. Meanwhile, the most powerful modern computers can perform several tens of quadrillions of operations per second (petflops).

If you were to travel a quadrillion kilometers (which is approximately 100 light-years), you could visit several stars closest to Earth and return back. In about 200 quadrillion seconds, the Sun will transition into the red giant stage.

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