Earth brightness

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• Earth and Space Sciences — ▪ 1996 Introduction GEOLOGY AND GEOCHEMISTRY       In 1995 significant developments took place in the realm of geologic mapping, which provides the foundation for the presentation and comparison of data in the Earth sciences. The most important… …   Universalium

• Earth impact hazard — ▪ astronomy Introduction  the danger of collision posed by astronomical small bodies whose orbits (orbit) around the Sun carry them near Earth. These objects include the rocky asteroids and their larger fragments and the icy nuclei of comets.… …   Universalium

• Brightness Reef — infobox Book | name = Brightness Reef title orig = translator = image caption = Cover of first edition (hardcover) author = David Brin illustrator = cover artist = country = United States language = English series = Uplift Universe genre =… …   Wikipedia

• earth — /errth/, n. 1. (often cap.) the planet third in order from the sun, having an equatorial diameter of 7926 mi. (12,755 km) and a polar diameter of 7900 mi. (12,714 km), a mean distance from the sun of 92.9 million mi. (149.6 million km), and a… …   Universalium

• Sky brightness — This article is primarily about the brightness of the night sky. For daytime situations, please see Diffuse sky radiation and Rayleigh Scattering. The fact that the sky isn t absolutely dark at night can easily be observed. Were the sky (in the… …   Wikipedia

• Low surface brightness galaxy — A low surface brightness galaxy or LSB galaxy is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky.Most LSBs are dwarf galaxies, in which most of their baryonic… …   Wikipedia

• Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …   Wikipedia

• Risks to civilization, humans and planet Earth — This article is about the near and very far future. For past civilizations, see Societal collapse. Contents 1 Types of risks 2 Future scenarios 2.1 …   Wikipedia

• List of Middle-earth objects — Arkenstone redirects here. For the composer of electronic and new age music, see David Arkenstone. J. R. R. Tolkien s Middle earth fantasy legendarium includes several noteworthy objects. The following list includes weapons, armour, jewellery,… …   Wikipedia

• Evolution of water on Mars and Earth — The evolution of H2O on either planet needs be understood in the context of the other terrestrial planetary bodies and their current H2O inventories.H2O Inventory of MarsA significant amount of surficial H has been observed globally by the Mars… …   Wikipedia

• Lowell Observatory Near-Earth-Object Search — (LONEOS) was a project designed to discover asteroids and comets that orbit near the Earth. The project, funded by NASA, was directed by Dr. Ted Bowell of Lowell Observatory in Flagstaff, Arizona. The LONEOS project began in 1993 and ran until… …   Wikipedia