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How many galaxies are there in the universe? How were they discovered? How many have been discovered?

Answer 1

No one knows, but probably billions.

The question of "how many have been discovered" is challenging because it is currently impossible to conduct an accurate count; only a few thousand galaxies have been catalogued. Galaxies are discovered using visual telescopes; the more distant ones require telescopes that can analyze spectral shift.

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Answer 2

Clara Avalos

The exact number of galaxies in the universe is unknown, but estimates suggest there are between 100 billion and 200 billion galaxies. Galaxies were first discovered in the early 20th century, when astronomers began using telescopes to observe the night sky. Since then, advances in technology have allowed astronomers to discover and study many more galaxies. To date, astronomers have discovered and cataloged over 3,000 galaxies, with new galaxies being discovered regularly.

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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.