Astronomers normally use parsecs to define distance on a galactic scale. The definition of a parsec is quite difficult to visualise if you are not familiar with terms such as parallax and arcsecond. (The word parsec is derived from these terms; parallax arcsecond).
In contrast to this, it is easy to grasp the concept of a light year. It is the distance that light travels [in a vacuum] in one [Julian] year. This is why popular science articles tend to express distances in light years.
No one on earth knows. The universe hasn't been measured, and we may never reach the ends of the universe, if the universe ever ends.
The distance between planets are measured in millions of kilometers while the distance between solar systems are measured in light years while the galxies and the universe are measured in AU (astronautical units)
The distance is getting larger as the universe expands.
The distance between the countries can be find by travelling
Distance is measured in kilometres, such as the distance between two towns, or the distance from the Earth to the Moon.
A longitudinal wave does not have a specific wavelength because it is measured by the distance between compressions or rarefactions, rather than the distance between wave crests.
The distance between galaxies is significant in understanding the vastness of the universe because it shows the immense scale of the cosmos. The vast distances between galaxies highlight the sheer size and expanse of the universe, giving us a sense of how small and interconnected we are in the grand scheme of things.
Stars are not measured in light years. The distance between them is.
Distance.
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Distance is measured using reference points therefore distance, between objects, is relative. Some of the units used can be absolute, the separation between two or more points cannot.
It is more likely to be measured in miles, or kilometres, due to the distance between the two cities.