Talk:Himiko (Lyman-alpha blob)

This article is rated Stub-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

‹See TfM› Physics Mid‑importance This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles Mid This article has been rated as Mid-importance on the project's importance scale. Astronomy: Astronomical objects Mid‑importance This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy articles Mid This article has been rated as Mid-importance on the project's importance scale. This article is supported by WikiProject Astronomical objects, which collaborates on articles related to astronomical objects.

"It is 12.9 billion light years from Earth, and since light-year is the distance light travels in a year, about 6 trillion miles (10 trillion kilometers). An object 12.9 billion light-years away is seen as it existed 12.9 billion years ago, and the light is just now arriving." - it isn't. I forget the exact equation, but it took the light 12.9 billion light-years to reach us. Due to the expansion of space, it was a lot closer when the light was emitted - a few hundred million light-years - and is now some tens of billions of light-years away.

I sure wish you physicist-types would define what it is you consider an "object". I've run across a host of Wiki entries that say that X is the largest object yet discovered in the universe. Obviously, the term is somewhat subjective, as a grouping of like objects can be considered an object it itself.

-- Frunobulax (talk) 15:13, 14 July 2013 (UTC)[reply]