Contributions

If you like the website and want to contribute to the running costs then please do so below. All contributions are most welcome.

PayPal - The safer, easier way to pay online.

An optical filter that's used to observe faint nebulae. It filters out all light except the hydrogen-beta line at 486.5nm. Very faint challenging objects such as the Horse Head Nebula and California Nebula are easier to detect with a hydrogen-beta filter.

Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z