The following are astronomy resources available online.
Comets
- SKY Online's Comet Page
- Observable Comets - CBAT, MPC, ICQ
- BAA Comet Section
- Dates of Last Observation of Comets
Supernovae
- Central Bureau for Astronomical Telegrams - Possible Supernovae
- CBAT Supernovae list up to 2015 (more current data requires a subscription)
Planetary Missions
Extra-Solar Planetary Systems
Astronomy Tools
- Calculation of residuals of asteroid positions
- New Object Ephemeris Generator
- Minor Planet Checker
- Minor Planet Ephemeris Service
- The NEO Confirmation Page
- OBSPLANNER: Minor Planet Observation Planner
- Recent MPECs
- CBAT/MPC/ICQ Index
- Asteroid Data Services by Lowell Observatory
- JPL's Solar System Dynamics (Solar System Data and Ephemeris Computation Service)
Astronomy News Sources & Resources
- Space Weather
- Space News
- Kennedy Space Center News
- BBC Tech News
- Marshall Space Flight Center - Science Research Office
- NASA TV
- European Southern Observatory Press Releases and Photos
- Hubble Space Telescope Photos and Press Releases
- JPL News
- Sky and Telescope's Weekly News Bulletin
- Telescope Guide - Getting Started with Telescopes & Astronomy
Archives
- Galileo Probe News Archive
- Cassini Probe News Archive
- Space Shuttle Missions
- New Millennium Program
- Stardust Mission