OBSERVING THE SOLAR SYSTEM Flashcards
What is Geocentric System?
Earth is at the center of the revolving planets and stars.
What is Heliocentric System?
The Sun is at the center of revolving planets, Earth and stars.
What did the Romans name the points of light that the Greeks called planets?
Mercury, Venus, Mars Jupiter and Saturn.
In the Geocentric System,what is at the center of the Universe?
The Earth
How was Ptolemy’s model different from the earlier Greek model?
He made the geocentric model but even though it was wrong the MOTIONS of the sky were correct.
A description of the Solar System revolving around the sun is called…….
heliocentric system
In the 1500’s who further developed the heliocentric explanation for the motion of the planets?
Nicolas Copernicus
What were two observations that Galileo made through his telescope that supported the heliocentric model?
- He discovered 4 moons revolving around Jupiter which means that everything doesn’t go around the Earth.
- He observed that Venus is always close t the Sun and that it has phases like the moon. This means that if everything went around the earth then all the phases of Venus would not be seen so the Earth cannot be the center of the Universe.
Whose ideas are accepted today? Copernicus, the people of ancient Greece, Ptolemy, the Romans.
Copernicus
What is an ellipse?
Kepler found that every orbit of a planet is an ellipse which is an oval shape, which can be elongated or almost circular.
What did COPERNICUS accomplish?
In the 1500’s he further developed the heliocentric model and he worked out arrangement of the planets.
BRAHE?
Late 1500’s, he observed and recorded the positions of the planets more accurately without a telescope.
GALILEO?
Early 1600’s, he used the telescope to make discoveries that supported the heliocentric model.
KEPLER?
Early 1600’s, He discovered that the orbits of the planets is an ellipse.
What does the solar system consist of ?
It consists of the sun, the planets and their moons, asteroids, comets, meteors, stars.
