EarthSky | Deneb: How astronomers know how far away it is
The star Deneb - part of the Summer Triangle - is one of the most distant stars you can see with your eye alone. Why don't we know its distance precisely?
Source: earthsky.org
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The star Deneb - part of the Summer Triangle - is one of the most distant stars you can see with your eye alone. Why don't we know its distance precisely?