How Does an Arc-Second Help Hubble Telescope See Fine Details in Space?

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SUMMARY

The Hubble Space Telescope has a resolution of approximately 0.1 arc-seconds, which defines its ability to distinguish between two closely spaced objects in space. This resolution allows Hubble to observe stars with angular disk sizes smaller than 0.1 arc-seconds, but it can only identify them as separate entities if they are positioned at an angle greater than this threshold. Understanding arc-seconds is crucial for comprehending the telescope's fine detail observation capabilities.

PREREQUISITES
  • Understanding of angular measurements, specifically arc-seconds
  • Basic knowledge of astronomical observation techniques
  • Familiarity with the Hubble Space Telescope's specifications
  • Concept of resolving power in optics
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wakejosh
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I looked it up in several areas on the web but nothing really helped, there is no definition in my physics book. anyway, I had a question about the Hubble telescope and I found its resolution to be about 0.1 arc-seconds . Thats great and all but what does that mean really? for example, how small an item is the Hubble able to see with that resolution?
 
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One degree of angle is divided into 60 minutes, each minute is divided into 60 seconds. So the number given is a very small angle. But this number is actually the resolving power. Hubble can see stars that have angular disk sizes much smaller than this. But it can only see two of them as distinct objects if they are separated by a larger angle than this.
 

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