The dimensions of the Universe and the astronomical objects of which it is made are extreme. To be able to express them in “human” units, such as metres or kilograms, special units had to be invented to avoid having numbers with dozens of zeros trailing behind them.
This video helps us comprehend the dimensions of objects in the Universe as well as the units used by astronomers. Being familiar with a few characteristic orders of magnitude makes it easier to position yourself in such a vast space and to imagine the immensity of the Universe.
For more information: The application developed by Neal Agarwal is an entertaining means of learning the size ratios between the celestial bodies in the Universe. Similarly, you can travel from the infinitely small to the infinitely large using this application.
We often talk of distances, but speeds in the Universe can be just as dizzying. This amusing application gives us an idea of these relative speeds.