Astronomy Picture of the Day
Explanation of Index Categories

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Below is an explanation of the categories used for the APOD images. Some categories are self-explanatory, but for others there are nuances.

The image is the primary determiner of the category. The text may suggest a second category. Other categories may be added as appropriate. Each image may fall into as many as five categories. But there are some pages that don't fit into any category (ex. October 4, 2011).

"--" indicates a label for a group of categories. Categories are in bold-face.

--Solar System --Cosmos --Sky - These images include images of the night sky or large portions of the sky. --Space Technology - These categories highlight telescopes, satellites, etc. used in astronomy. --People
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Official: Phillip Newman. Specific rights apply.
A service of: ASD at NASA/GSFC
& Michigan Tech. U.

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