How is the size of a galaxy measured?

Answer 1

In light years for actual measured distance. In the red shift for its age and the distance light has traveled.

In general, light years and astronomical units (AU) for objects within our solar system, but the actual size of our universe is somewhat in doubt due to the limitations of our current technology to "see" and measure objects, galaxies, stars, at the furthest reaches of our universe.

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Answer 2

Luca de

The size of a galaxy is typically measured in terms of its angular size, which is the apparent size it occupies on the sky, or its physical size, which is the actual size of the galaxy. Angular size is measured in degrees, arcminutes, or arcseconds, while physical size is often measured in light-years or parsecs. Astronomers use various techniques such as angular diameter measurements, photometry, and spectroscopy to determine the size of galaxies.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.