- Astronomy Picture of the Day: Earth
Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
http://antwrp.gsfc.nasa.gov/apod/earth.html
(Added: Mon Oct 28 2002)
- Auroras
The aurora, or northern and southern lights, are often visible from the surface of the Earth at high northern or southern latitudes. Auroras typically appear as luminous bands or streamers that can extend to altitudes of 200 miles (well into the ionosphere).
http://csep10.phys.utk.edu/astr161/lect/earth/aurora.html
(Added: Sat Oct 26 2002)
- Coriolis Effect
Coriolis effect is an inertial force described by the 19th-century French engineer-mathematician Gustave-Gaspard Coriolis in 1835. Coriolis showed that, if the ordinary Newtonian laws of motion of bodies are to be used in a rotating frame of reference, an inertial force--acting to the right of the direction of body motion for counterclockwise rotation of the reference frame or to the left for clockwise rotation--must be included in the equations of motion.
http://zebu.uoregon.edu/~js/glossary/coriolis_effect.html
(Added: Sat Oct 26 2002)
- Earth - The Nine Planets
The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system. Each page has text and images, some have sounds and movies, most provide references to additional related information.
http://seds.lpl.arizona.edu/nineplanets/nineplanets/earth.html
(Added: Sun Oct 06 2002)
- Earth Fact Sheet
Contains the mass, volume, escape velocity, orbital elements, spin rate, and many other parameters.
http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html
(Added: Sun Oct 06 2002)
- Foucault Pendulum
The Foucault Pendulum was the first terrestrial device to demonstrate the rotation of the earth. The California Academy of Science has been creating the Foucault Pendulum for educational and commercial institutions since 1951.
http://www.calacademy.org/products/pendulum.html
(Added: Mon Oct 28 2002)
- Foucault Pendulum
The Foucault Pendulum is named for the French physicist Jean Foucault (pronounced "Foo-koh), who first used it in 1851 to demonstrate the rotation of the earth. It was the first satisfactory demonstration of the earth's rotation using laboratory apparatus rather than astronomical observations.
http://www.si.edu/resource/faq/nmah/pendulum.htm
(Added: Sat Oct 26 2002)
- Global Warming
This EPA site has information and resources on a changing atmosphere and climate, emissions and greenhouse gases, the potential impacts of global warming, and what can be done about it.
http://yosemite.epa.gov/oar/globalwarming.nsf/content/index.html
(Added: Mon Oct 28 2002)
- Interior of the Earth
The study of the Earth's surface and interior is the domain of geology. We know little directly about the interior of the Earth. Most of our information in that regard has come from seismic waves, which are vibrations in the body of the Earth.
http://csep10.phys.utk.edu/astr161/lect/earth/interior.html
(Added: Sat Oct 26 2002)
- Oceanography from the Space Shuttle
Oceanography from the Space Shuttle is a pictorial survey of oceanic phenomenon visible to the naked eye from space.
http://daac.gsfc.nasa.gov/CAMPAIGN_DOCS/OCDST/shuttle_oceanography_web/oss_cover.html
(Added: Sat Oct 26 2002)
- Plate Tectonics
It is now uniformly agreed that the crustal plates of the Earth are in horizontal motion. This is called continental drift colloquially, and plate tectonics (see also this summary) in technically more precise language. A great animation is shown on this page.
http://csep10.phys.utk.edu/astr161/lect/earth/tectonics.html
(Added: Sat Oct 26 2002)
- Precession of the Earth's Axis
The Earth's rotation axis is not fixed in space. Like a rotating toy top, the direction of the rotation axis executes a slow precession with a period of 26,000 years.
http://csep10.phys.utk.edu/astr161/lect/time/precession.html
(Added: Sat Oct 26 2002)
- The Age of the Earth
How old is the Earth, and how do we know?
http://www.talkorigins.org/faqs/faq-age-of-earth.html
(Added: Sat Oct 26 2002)
- The Earth's Magnetosphere
The Earth has a substantial magnetic field, a fact of some historical importance because of the role of the magnetic compass in exploration of the planet.
http://csep10.phys.utk.edu/astr161/lect/earth/magnetic.html
(Added: Sat Oct 26 2002)
- The Greenhouse Effect
The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re-radiation from the heated objects are unable to pass through that medium.
http://www.h2othouse.com/html/greenhouse_effect.html
(Added: Sat Oct 26 2002)
- Van Allen Belts
These radiation belts are regions of high-energy particles, mainly protons and electrons, held captive by the magnetic influence of the Earth.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970228a.html
(Added: Sat Oct 26 2002)
- Why is the sky blue?
Howstuffworks provide the answer to this common question and provides related links.
http://www.howstuffworks.com/question39.htm
(Added: Sun Oct 27 2002)
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