the measurement of a stellar image
21Orion Nebula — The entire Orion Nebula in visible light. Credit: NASA/ESA Observation data: J2000 epoch …
22Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …
23Weak gravitational lensing — While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak… …
24Sun — This article is about the star. For other uses, see Sun (disambiguation). The Sun …
25Pluto — This article is about the dwarf planet. For other uses, see Pluto (disambiguation). Pluto   …
26Albert Abraham Michelson — Infobox Scientist name = Albert Abraham Michelson caption = Albert Abraham Michelson birth date = birth date|1852|12|19|mf=y birth place = Strzelno, Kingdom of Prussia death date = death date and age|1931|5|9|1852|12|19 death place = Pasadena,… …
27photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
28Sirius — B redirects here. For other uses of Sirius, see Sirius (disambiguation). For other uses of Sirius B, see Sirius B (disambiguation). Sirius A / B …
29Andromeda Galaxy — The Andromeda Galax …
30History of astronomical interferometry — See also: astronomical interferometerWilliam Herschel knew as early as 1779 (Herschel 1805) that stars appeared much larger in telescopes than they really were but he did not know why. When Thomas Young demonstrated interference and the wave… …
