If a star is twice as far away, is it true that it will appear to us 4 times dimmer?(adsbygoogle = window.adsbygoogle || []).push({});

If this is true, can we assume that if we wish to view an object twice as far away while maintaining the same clarity, then the primary mirror of a telescope would have to be 4 times larger in diameter?

**Physics Forums - The Fusion of Science and Community**

# Light-gathering abilities?

Know someone interested in this topic? Share a link to this question via email,
Google+,
Twitter, or
Facebook

- Similar discussions for: Light-gathering abilities?

Loading...

**Physics Forums - The Fusion of Science and Community**