Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003asthe..96..646s&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 96, No. 12, p. 646 - 655 (2003)
Astronomy and Astrophysics
Astronomy
Universe: Distance Scale
Scientific paper
In these days, we often see articles in the news paper something like "the distance to the object is 10 billion light year", or "the image reveals the universe of 2 billion years old". These are articles to explain observational results by large telescopes such as Subaru, Keck, or Hubble space telescope. From these articles, however, it is difficult for us to get insight about such huge distances and to know how these distances are measured. We notice the difference of phrasing of these two examples while it is not clear why they are different. I was requested by Tenmon-Geppou editorial board to review how to measure distances in the universe and explain meaning of each distance, that is described in this paper. In particular, I discuss the cosmic distance ladder and the definition of distances in the expanding universe.
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