Question

What is the slowest thing in the universe?​

Answer 1

Answer:

Xenon-124.

Explanation:

Xenon-124, one of the radioactive noble gases, has an extremely long half-life. The half-life of xenon-124, one isotope of xenon, was recently measured to be a trillion times longer than the age of the universe! This is the slowest process ever measured by direct observation.

Answer 2

Answer:

The half-life of xenon-124, one isotope of xenon, was recently measured to be a trillion times longer than the age of the universe! This is the slowest process ever measured by direct observation. You might well ask who measured such a slow process.

Explanation:

For comparison, the molecules in your body could dash across that room in just a fraction of a second. The atoms in our frigid atom cloud quite literally move at less than a snail's pace – and that cloud is the slowest thing on Earth.