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For more details on background of the project, you can read the original vision from when the project was founded.
The astropy package (alternatively known as the "core" package) contains various classes, utilities, and a packaging framework intended to provide commonly-used astronomy tools. It is divided into a variety of sub-packages, which are described in detail in the documentation.
The Astropy project includes the concept of "affiliated packages." An affiliated package is an astronomy-related python package that is not part of the astropy core source code, but has requested to be included in the general community effort of the Astropy project. Such a package may be a candidate for eventual inclusion in the main astropy package (although this is not required). Until then, however, it is a separate package, and may not be in the astropy namespace.
The authoritative listing of current affiliated packages is available at http://affiliated.astropy.org. That page also describes the process to get a package listed as an affiliated package.
Astropy is licensed under a three-clause BSD license. For details, see the LICENSE.rst file in the astropy repository.
Astropy governance is as laid out in APE 0, consisting of the Coordination Committee, the Ombudsperson, and the Voting Members. Accompanying policies are documented in the project policies folder.
Astropy is a Sponsored Project of NumFOCUS, a 501(c)(3) nonprofit charity in the United States. NumFOCUS provides Astropy with fiscal, legal, and administrative support to help ensure the health and sustainability of the project. Visit numfocus.org for more information.