Astronomical Data

Moon

Planets

Solar System

Stars

Galaxies

Eclipses

Data Centers

Catalogues

Astrophotos

Softwares

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Organisations

The Morphological Classification of Galaxies

NASA / IPAC Extragalactic Database

New General Catalogue (NGC Objects)

The NGC / IC Project

Index Catalogue of 1895 (IC Objects)

The NGC / IC Project

Index Catalogue of 1908 (IC Objects)

The NGC / IC Project

Active Galaxies

Active Galaxies Links Page : NASA / IPAC Extragalactic Database

Active Galaxies : Newsletter

  Overlapping pairs of Galaxies

University of Alabama, Dept.of Physics & Astronomy

  Seyfert Galaxies

Seyferts : The concept : NASA / IPAC Extragalactic Database

Seyfert's original list

Quasars

Quasar Surveys : NASA / IPAC Extragalactic Database

Sloan Digital Sky Survey Quasar Catalog

Frequently Asked Questions : Virginia Tech

  BL Lac Objects

BL Lac Sample Oriented Catalogue : Paolo Padovani

  BL Lac Links Page : Steve's Gamma Ray Burst Astronomy Site

Gravitational Lenses

Simulation of a Gravitational Lens

Summary of Multiply Imaged Systems : Radio Astronomy Group

Clusters of Galaxies

Clusters of Galaxies : NASA / IPAC Extragalactic Database