galactic space radiation
71chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… …
72Messier 87 — Virgo A The Messier 87 galaxy. Observation data Epoch J2000 Constellation Virgo Right ascension …
73Big Bang — This article is about the cosmological model. For the sitcom, see The Big Bang Theory. For other uses, see Big Bang (disambiguation) …
74List of Star Wars creatures — This is a list of creatures in the fictional Star Wars universe. In order to be listed here, creatures must be noted in multiple canonical sources. Contents: Top · 0–9 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 …
75Stars and planetary systems in fiction — The planetary systems of stars other than the Sun and the Solar System are a staple element in much science fiction. Contents 1 Overview 1.1 The brightest stars …
76Supernova — This article is about the astronomical event. For other uses, see Supernova (disambiguation). Multiwavelength X ray, infrared, and optical compilation image of Kepler s supernova remnant, SN 1604. A supernova is a stellar explosion that is more… …
77Cygnus X-1 — For other uses, see Cygnus X 1 (disambiguation). HDE 226868 HDE 226868 (not shown) is located next to the star η (lower center) in this map of constellation Cygnus …
78Hyperspace (science fiction) — Hyperspace is a fictional plot device sometimes used in science fiction. It is typically described as an alternate region of subspace co existing with our own universe which may be entered using an energy field or other device. Travel in… …
79Planetary habitability — is the measure of a planet s or a natural satellite s potential to develop and sustain life. As the existence of life beyond Earth is currently uncertain, planetary habitability is largely an extrapolation of conditions on Earth and the… …
80spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
