Astronomy for Beginners
Here’s where you’ll find observing guides, how-to articles and great astronomy hints and tips. Don’t forget to also check out our comprehensive astronomy dictionary.
A galaxy that doesn’t show any obvious structure or form. They don’t fall into any of the normal classes of galaxy found in the ‘Hubble Tuning Fork Diagram’.
An optical double star is actually two stars that appear to be close to each other on the sky. In fact they are not at all related and appear close only because they lie close to each other along our line of sight.
A Ronchi grating is a special type of diffraction grating used in optical tests. It’s used to find the quality of a scope’s mirror by studying the diffraction patterns produced by light bounced off the mirror.