State whether the following statements are true or false:

Astronomers estimate the size of the universe.

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True

False

answer is A.

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Detailed Solution

The given statement is true.
Concept: The size of the universe is measured using a variety of techniques and approaches. The majority of these methods for measuring distance build upon earlier methods, providing us a "ladder" of methods for measuring distance that improves our understanding of measuring cosmic distances.
Because the universe is growing at rates close to the speed of light, discussing the entire universe while attempting to answer the issue of how big is our universe would be less logical. Therefore, measuring the extent of the "seen" cosmos is what we mean when we say that we are estimating the size of the universe.
Red Shift, a scientific procedure, is currently used to accomplish this. similar to how the Doppler effect causes a car's horn to change pitch as it passes by. Depending on whether it is travelling toward or away from us, light also changes in frequency or colour. It has been noticed that light changes for red as it goes away from us. It shifts more the farther away from us it is travelling comparatively quickly. When we witness (look at) a light wave we measure its redshift to determine how far the light wave has travelled from its place of origin to this location, estimating that it has come from the farthest reaches of our cosmos.
Hence, the given statement is true.

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