Physical Science

Meteor falls near Chelyabinsk, Russia
By: Leigh Goessl
In an event that looked right out of a science fiction movie, on Feb. 15 Russia experienced a meteor falling that led to a large number of people being injured. According to PBS' News Hour, the meteor had traveled at 20 miles per second before...
 What is the difference between centripetal and centrifugal force? By: Steven Mars The definition of centrifugal force, according to dictionary.com, is “An outward force on a body rotating about an axis, assumed equal and opposite to the centripetal force and postulated to account for the phenomena seen by an observer in the rotating body.&rdquo...
By: Gaynor Paynter
Terminal velocity occurs when a falling object stops accelerating and falls at a constant speed. The word velocity itself refers to the rate that an object changes position. When an object falls there comes a time when it reaches a constant velocity, otherwise known as...
What is meant by the terminal velocity of a falling object?
By: Steven Mars
The definition of terminal velocity is, according to dictionary.com, “The velocity at which a falling body moves through a medium, as air, when the force of resistance of the medium is equal in magnitude and opposite in direction to the force of gravity...
Why Galileo's use of the telescope got him into trouble with the Inquisition
By: Nwachukwu Lawson Luke
In Venice, in 1609, Italian astronomer and mathematician, Galileo Galilei heard rumors that a Dutch spectacle maker had invented a spyglass. Later renamed telescope, this device was believed to make distant objects appear nearer. A patent had been requested, but was yet to be granted...
Warning Time is the Key to Averting an Asteroid Catastrophe
By: E.L. Colme
Imagine hearing news reports that a large, newly discovered comet from deep space is found to be on an intersecting orbit with the Earth. Astronomers are stunned to discover the 7-kilometer wide object, comprised of ice and rock, has a high probability of colliding with...
Do not be Afraid
By: Peter Roeder
It is highly unlikely that a major asteroid will hit Earth and make a lot of damage. Although like in Russia recently an asteroide hit this major doomsday scenario is just not realistic. There are more important things to worry about: Unemployment benefits for all...
Ways in which truth and science walk hand in hand
By: Christyl Rivers
Science is often dismissed because truth is not considered by most people to be synonymous with theory. Because science seeks to always stay open to new explanations, theories are not considered as fact. That said, there are not many people who question whether the sun...
By: Ruth Belena
Cecilia Payne-Gaposchkin was an eminent British-born astronomer and astrophysicist. She wrote many books, papers and monographs on astronomy and astrophysics, and she received many accolades for her scientific work and research into the composition, evolution, magnitude and distance of stars. Cecilia Helena Payne was born...
The discoveries of Cecilia Payne-Gaposchkin
By: Robin Lamb
The story of Cecilia Payne-Gaposchkin is a tale of achievement against the odds. Blessed with a brilliant mind, but cursed – professionally - with a womb, she battled endemic prejudice in her chosen field until late in her career. And yet, some of her theories...

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