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The distance from Deneb to the earth is still somewhat uncertain. One 2008 study

puts the most likely distance at 1,550 light-years, but there is still a considerable

uncertainty of more than 10%. The reduced parallax uncertainties do not rule out

a distance as close as 1,340 light-years or as far as 1,840 light-years. Deneb is

the farthest first-magnitude star from Earth.

(The number of years required for its light to reach earth is the same as its distance

in light years.)

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