A branch of astronomy that involves the study of precise measurements of the positions and movements of stars and other celestial bodies. It has led to the discovery of numerous extrasolar planets. The gravitational attraction of a planet causes its star to "wobble" very slightly, which can be detected.

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


Sky Highlights - April 2017

Shop at Amazon US

Shop at Amazon US

Current Moon Phase

CURRENT MOON

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.