Question

1. why is it that a single galaxy can have two different names?
2. how were the galaxies leo i and andromeda ii named?

Explanation:

Question 17

Galaxies can have multiple names due to different cataloging systems. Various astronomical catalogs (like Messier, New General Catalog, etc.) exist, each with its own naming conventions. A galaxy might be discovered and named in one catalog, then later identified in another with a different name. Also, historical or cultural naming (e.g., local names) and scientific re - classification can lead to multiple names.

Galaxies like Leo I and Andromeda II are often named based on the constellation they are associated with and a numbering system. Leo I is named after the constellation Leo (the lion) and the "I" indicates it's the first (or a numbered) galaxy associated with that constellation. Andromeda II is named after the constellation Andromeda, with "II" signifying its numbered position among galaxies related to that constellation. This follows a common astronomical naming convention where satellite galaxies (or galaxies in the vicinity of a major galaxy) are named after their host constellation and a numerical identifier.

Answer:

A single galaxy can have two different names because of different astronomical cataloging systems (each with unique naming rules), historical/cultural naming, and scientific re - classification. Different catalogs (e.g., Messier, NGC) may identify the same galaxy with distinct designations, and other naming factors like local traditions or re - evaluation of the galaxy's properties can also contribute.

Question 18