An eyepiece which has threads across the field of view for more accurate measurement. A large group of stars, gas, and dust held together by mutual gravitational attraction. The tendency for all matter to be attracted to all other matter. A method for increasing resolving power by combining light obtained by two or more telescopes. The rate at which light is emitted from an object.
Higher magnitudes are fainter objects, lower magnitudes are brighter objects.
A large, fast computer which can handle several tasks at the same time. The total amount of material in an object. A machine used to measure the positions and brightnesses of objects on photographic plates. A fragment of material from space which falls into Earth's atmosphere and vaporizes. The galaxy in which our solar system resides.