Eccentricity of an Orbit - Windows to the Universe
If an ellipse has a high eccentricity, is it round like a circle or long like an oval? Click on image for full size Original animation by Windows to the Universe staff (Randy Russell). Related links:Animation showing shapes of orbits Elliptical orbits Perihelion and aphelion Kepler's Laws of Planetary Motion Eccentricity of an Orbit You may think that most objects in space that orbit something else move in circles, but that isn't the case
See the difference? The Relationship Between Gravity and Mass and Distance As stated above, your weight is a measure of the pull of gravity between you and the body you are standing on. For everyday-sized objects, this gravitational pull is vanishingly small, but the pull between a very large object, like the Earth, and another object, like you, can be easily measured
Tracking Twisters With Radar Can new weather radar networks spot tornadoes earlier and thereby save lives? NOVA Education Close You need the Flash Player plug-in to view this content. Quiz: Hurricanes Five questions that will separate the hurricane know-it-alls from the rest of us Anatomy of a Tsunami See how the tsunami of 2004 developed, from its birth at the seafloor to its impact on coasts around the Indian Ocean
The Age of the Earth
(If I applied the same standards to the fairly large collection of creationist materials that I own, none would remain.) Common Creationist Criticisms of Mainstream Dating Methods Most creationist criticisms of radiometric dating can be categorized into a few groups. "meteoritic material" Some folks in talk.origins occasionally sow further confusion by discussing the thickness of the "lunar soil" as if it represented the entire quantity of meteoritic material on the lunar surface
Imagine the Universe!
NASA Satellites Catch 'Growth Spurt' from Newborn Protostar Using data from orbiting observatories, including NASA's Spitzer Space Telescope, and ground-based facilities, an international team of astronomers has discovered an outburst from a star thought to be in the earliest phase of its development. NASA's Swift Satellite Marks 10 Years of Game-changing Astrophysics Over the past decade, NASA's Swift Gamma-ray Burst Explorer has proven itself to be one of the most versatile astrophysics missions ever flown
Exploring Planets in the Classroom: Hands-on science activities
We appreciate hearing from you and are willing to correspond ...because that helps us help you share the excitement of space! It also helps us write our end-of-the-year reports on how useful the web site is in different grade levels and settings across the planet. Exploring Planets in the Classroom: Hands-on science activities - - - EXPLORING PLANETS IN THE CLASSROOM * HANDS-ON ACTIVITIES - - -Hawai'i Space Grant Consortium More than 25 hands-on science activities are provided in classroom-ready pages for both teachers and students for exploring Earth, the planets, geology, and space sciences
How does gravity work? - HowStuffWorks
Photo courtesy of NASA Up Next How Special Relativity Works How Weightlessness Works HowStuffWorks Forums: What's your favorite anti-gravity invention (real or imagined)? Every time you jump, you experience gravity. The mystery of gravity's pull is pretty much intact.So what do we know about gravity? We know that it causes any two objects in the universe to be drawn to one another
Orifice - A precisely formed hole in a plastic pipe or tube or in a small fitting (known as an emitter) plugged into plastic pipe through which water flows out in drops or a tiny stream. All things considered, a spacing of 2 feet between emitters is best for most closely spaced plants and soils; a spacing of 18 inches might be better in very sandy soil
http://hudsonvalleygeologist.blogspot.com/2010/08/magical-mecca.htmlFunniest comment I read about this article (but an obscure reference for most people) is that the Muslim fundamentalists making these claims are the Juggalos of Arabia (watch this NWS video which made the rounds on numerous science blogs a few months ago to understand)
Eric Christian Changes in Earth's Gravitation and Magnetic Field? Where can I find historical daily data on the Earth's gravitation and magnetic field? As far as I know, there is no significant change of Earth's gravitation with time, because this is only a function of the Earth's size and mass, both of which are not changing significantly over time. And as you pointed out correctly, the Sun's gravity is much more powerful than Earth's, and that is because of its much larger mass.However, the effects of gravity on other objects also scale inversely with the square of their distance from each other
DOPPLER SHIFT A shift in an object's spectrum due to a change in the wavelength of light that occurs when an object is moving toward or away from Earth. I IMPACT CRATERS Craters which are the result of a collision between a large body, such as a planet or satellite, and a smaller body such as an asteroid or meteorite
It isn't, but the general trend described here still holds.) At the center, the gravity from the mass beneath your feet all the way to the other side of the Earth, the Indian Ocean, will be "pulling" you down, even as the mass above your head is "pulling" you up, toward L.A. The strength of gravitational attraction is determined by an object's mass and how close it is to another (more mass and closer together means increased force)
The magnetic field of the earth (or any force field for that matter) is not a single line, but a whole field (like the atmosphere around us can be described as a field) surrounding the central line (which evidently runs through the core of the earth). If there is a zero-(earth) magnetism point on Mecca, or any other city for that matter, then all the cities, towns, villages and hamlets that share the same latitude share that privilege
Therefore, the only interesting concept in the entire video is the very first one, that the ratio of the distance from the South Pole to Mecca has a golden ratio proportion to the North Pole from Mecca (which itself is in significant error). The actual error tolerance may be much larger, but the most conservative estimate would be assuming the video is correct, they tolerated at least an error of 20km in their calculations
Finally, Newton reasoned that if the cannon projected the cannon ball with exactly the right velocity, the projectile would travel completely around the Earth, always falling in the gravitational field but never reaching the Earth, which is curving away at the same rate that the projectile falls. It follows that mass is constant for an object (actually this is not quite true, but we will save that surprise for our later discussion of the Relativity Theory), but weight depends on the location of the object
Earth Moon Center of Gravity
The earth is much more massive than the moon and thus the center of mass is actually inside the earth, about 4600 km from the center while the radius of the earth is about 6400 km (thanks to Tim Dierks for corrrecting my earlier version of this essay where I had the center of mass outside the earth). Since the moon is closer, the percent difference of the gravitational pull from one side of the earth to the other, 8,000 miles apart, is much more than the percent difference in the pull of the sun
gravity - Would you be weightless at the center of the Earth? - Physics Stack Exchange
If one assumes constant density for the Earth (which isn't strictly speaking true but it is close enough for this illustration) the gravitational acceleration drops linearly from 1g at the surface to 0 at the center of the Earth. Basically the reason is that the force from the small bit of mass directly above you is balanced out by the force from the large remainder of the mass below you
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