Terms in this set (38)
the study of objects and matter in Space and their physical and chemical properties
spinning of a planet or object on it's axis
the action by a celestial body of going around another object in an orbit or elliptical course
The path a celestial body takes around another object.
The Sun-centered solar system model.
The Earth-centered solar system model.
A natural satellite of a planet
An object large enough to be round that orbits a star.
Super massive clouds of plasma and gas that produce heat and light through the process of nuclear fusion
The fusing of two atomic nuclei to produce a new element.
The super dense remains of ancient neutron stars. They are so dense that light itself cannot escape the event horizon.
The distance light travels in one Earth year.
Astronomical Unit (AU)
The average distance between the Earth and the Sun (93 million miles)
the force of Earth's gravity on an object with a mass of about 102 g
Newton's 1st Law of Motion
An object at rest tends to stay at rest, an object in motion tends to stay in motion unless acted upon by an external force.
Newton's 2nd Law of Motion
The force on an object is proportional to the product of the acceleration and mass of an object providing that the mass stays constant.
Newton's 3rd Law of Motion
For every action there is an equal and opposite simultaneous reaction.
Newton's Law of Universal Gravitation
The amount of gravitational attraction between two objects is directly related to their mass and inversely related to the square of the distance between them.
A star and the objects that rotate around it within its gravitational field.
A collection of hundreds of millions or billions of solar systems that has a black hole at the center.
A grouping of millions or hundreds of millions of galaxies.
All of the known Galaxies.
The Galaxy that our solar system is within.
When the Earth's tilt is either directly towards or away from the Sun.
When the Earth's tilt is along its orbital path, not towards or away from the Sun.
The pattern of changing weather systems caused by the tilt of the Earth on it's axis.
one rotation of the Earth on its axis.
One revolution of the Earth around the Sun.
Big Bang Theory
The scientific explanation of the origin of the Universe.
The apparent motion of planets that are viewed from Earth that appear to move backwards. Serves as proof for the Heliocentric model.
Kepler's 1st law of motion
Each planet revolves around the Sun in an elliptical orbit with the Sun at one focus.
An object with two lines of symmetry (oval).
the line connecting the two points furthest away on an ellipse.
the line connecting the two points closest together on an ellipse.
one of two points along the major axis
(Foci - refers to the two points)
the "flatness" of an ellipse.
Defined as the ratio of the distance between foci and the length of the major axis.
Kepler's 2nd law of motion
The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse.
Kepler's 3rd Law of motion
A planet's period, P, (measured in Earth years) of revolution squared is proportional to its distance, R, (measures in A.U.s) from the Sun cubed.