NASAの写真は奇麗

今日は
NASA
のホームページで教育用著作権フリーの写真を収集。

NASAのページによると、

NASA still images; audio files; video; and computer files used in the rendition of 3-dimensional models, such as texture maps and polygon data in any format, generally are not copyrighted. You may use NASA imagery, video, audio, and data files used for the rendition of 3-dimensional models for educational or informational purposes, including photo collections, textbooks, public exhibits, computer graphical simulations and Internet Web pages. This general permission extends to personal Web pages.

とのこと。

最近、素材にかかるお金が結構大変なので助かります。