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Gravity and Space

In the physical sciences, mass and weight are different properties. Mass is an
inertial property that is, the tendency of an object to remain at constant velocity
unless acted upon by an external force. Weight is the force created when a mass
is acted upon by a…

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Night and day on Earth
Day is when the Earth is orbiting the sun (whilst turning itself) projecting the sun's
light onto the Earth as it goes. Only one side at a time can have the sun on it as
light cannot reach the other side of the planet. Night…

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Phases of the moon on the Northern hemisphere

Phases of the Southern hemisphere

The first artificial satellite was Sputnik 1, launched by the Soviet Union on 4
October 1957. This triggered the Space Race between the Soviet Union and the
United States.
In May, 1946, Project RAND had released the…

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oceans, assist in the navigation of ships and aircraft, monitor crops and other resources, and support
military activities.
Artificial satellites also have orbited the moon, the sun, asteroids, and the
planets Venus, Mars, and Jupiter. Such satellites mainly gather information about
the bodies they orbit.
An artificial satellite is a…

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equally systematic presentation of a heliocentric geometrical model by Nicolaus



Portrait from
Toru, early
16th century

February 19, 1473,
Toru (Thorn), Royal Prussia, Poland
May 24, 1543 (aged 70),
Frombork (Frauenburg), Warmia, Poland
Mathematician, astronomer, jurist, physician, classical scholar,
Catholic cleric, governor, military…

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modern observational astronomy", the "father of modern physics", the "father of
science", and "the Father of Modern Science." The motion of uniformly
accelerated objects, taught in nearly all high school and introductory college
physics courses, was studied by Galileo as the subject of kinematics. His
contributions to observational astronomy include…


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