Day RSS Feed – Official RSS feed Official list of alternative (mirror) sites for when the NASA APOD site is down Observatorio – Spanish official translation, with web2.0 features Starship Asterisk* – APOD and General Astronomy Discussion Forum Astronomy Picture of the Day (APOD) – Official Facebook Page Astronomy Picture of the Day App – Official iOS mirror APOD email service List of APOD Mirrors and Social Sites NASA online Astronomy education works American science websites Internet properties established in 1995