Erratum: Dyson spheres (Serb. Astron. J. - 200 (2020), 1)

Abstract

In the paper by Wright (2020), due to an editing error, Footnote 2 contains an incorrect citation. The intended meaning of the relevant parts of the footnote is as follows: As detailed in Gray (2020), many authors who discuss an extension of Kardashev's scale to noninteger values cite Carl Sagan's book The Cosmic Connection (Sagan 1973a), which has no explicit equation but describes one implicitly with some characteristic values. Wright et al. (2014) incorrectly cite an Icarus article by Sagan (1973b), which discusses the integer version of the scale but not noninteger extensions. In Table 1, the definition of s should read: Probability a photon emitted by inner surface of the Dyson sphere does not immediately strike the star : : : On page 7 immediately after Eq. (25), the end of the sentence should be: : : : represents the probability that a photon emitted from or reected by the interior of the sphere in a random direction will not strike the star before it strikes the sphere again. Eq. (23) should have units of g/m2, not g/cm2. Similarly, on page 15, col. 2, line 13, the units should be g/m2 (consistent with correction for Eq. (23)), not g/cm3. Link to the corrected article 10.2298/SAJ2000001W