The Physical Sciences Physics: The study of matter and energy and the interactions between them. Physicists study such subjects as gravity, light, and time. Albert Einstein, a famous physicist,…
THE GALILEAN MOONSJUPITER’S ATMOSPHEREJUPITER’S LIGHTSFIND OUT MOREJupiter is the biggest planet in our Solar System, eleven times bigger in diameter than Earth and two and a half times more…
(Encyclopedia) planet [Gr.,=wanderer], a large nonluminous body of rock, gas, or ice that orbits the sun or another star, has a rounded shape due to gravity, and has cleared its orbit of smaller…
(Encyclopedia) seismologyseismologysīzmŏlˈəjē, sīs– [key], scientific study of earthquakes and related phenomena, including the propagation of waves and shocks on or within the earth by natural or…
(Encyclopedia)
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Plate tectonics: Map of the world showing major plates and plate boundaries
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Plate tectonics: Schematic model of the oceanic crust, showing the three types of plate…
(Encyclopedia) Ptolemy (Claudius Ptolemaeus), fl. 2d cent. a.d., celebrated Greco-Egyptian mathematician, astronomer, and geographer. He made his observations in Alexandria and was the last great…
(Encyclopedia) stratospherestratospherestrătˈəsfēr [key], second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.51&fslsh;2 mi (9…
In 2016 peak viewing occurs on Nov. 16 and the early hours of Nov. 17
Related Links Meteor Showers The Perseids The Universe Space Exploration External Links NASA Sky…
In 2016 peak viewing occurs on Nov. 16 and the early hours of Nov. 17 Related Links Meteor Showers The Perseids The Universe Space ExplorationExternal Links NASA Sky & Telescope U.S.…
