Celestial Objects
a star which generates its own energy
1 AU from Earth
self luminous object (gives off its own light)
The Sun
Distance from sun to earth
1 Astronomical Unit (AU)
Earth was at the center of the universe
In Pre-Copernican astronomy, it was universally believed that...
The greater the mass of an object, the greater the amount of force is needed to accelerate it
Newtons Second Law
the apparent path of the sun against the background
Eliptic
groups of stars that make an apparent pattern in the sky
Constelations
distance traveled by light in one year
1 Light Year
Spots on the sun, craters on the moon, moons around Jupiter, and moon like phases of Venus
Galileo found with a telescope
An object continues in its state of rest or motion, unless an external force is applied to it
Newtons 1st Law
Polaris appears closer to the horizon
At lower altitudes
a great cloud of stars, gas and dust held together by gravity and all its matter
Galaxy
109 earth diameters
Diameter of the Sun
Spots on the sun, craters on the moon, moons around Jupiter, and moon like phases of Venus
Tycho Brahe's greatest contribution to astronomy
a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
Inertia
causes the north celestial pole to trace a circle on the sky, once every 26000 years
Precission
planets and all objects orbiting the sun
Solar System
in one hour stars move an angular distance of 15 degrees
Rate at which stars move
a planet should move at its greatest speed when it is closest to the sun.
Kepler's second law
For every action, there is an equal and opposite reaction
Newtons third law
projection of Earth's south pole on the Celestial Sphere
South Celestial Pole
Cluster of galaxies
Supercluster
4 minutes
How much earlier stars will rise than the previous night
He developed a theory of Gravity that could explain orbital motion.
Newton's greatest contribution to astronomy
Increases with the mass of the objects and decreases with the distance between them
The force due to gravity between objects
point on the Celestial Sphere directly underneath
Nadir