Observing the solar system
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Observing the Solar System. Mrs. Davis Earth Science. Solar System in Order. My – Mercury Very – Venus Educated – Earth Mother – Mars Just – Jupiter Served – Saturn Us – Uranus Nine – Neptune Pickles - Pluto. Wandering Stars.

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Observing the solar system

Observing the Solar System

Mrs. Davis

Earth Science

Solar system in order
Solar System in Order

My – Mercury

Very – Venus

Educated – Earth

Mother – Mars

Just – Jupiter

Served – Saturn

Us – Uranus

Nine – Neptune

Pickles - Pluto

Wandering stars
Wandering Stars

  • The Greeks noticed that the stars had a pattern that did not change but they noticed that there seemed to be five points of light that wandered among the stars.

  • They called these objects planets which means “wandering star”.

  • These planets were Mercury, Venus, Mars, Jupiter, and Saturn.

Greek ideas earth at the center
Greek Ideas: Earth at the Center

  • Aristotle

Believed that the universe is perfect and finite and that Earth is stationary at its center.

Geo – means Earth

Geo centric system – Earth is at the center of the revolving planets.


  • He thought that Earth is at the center of the system of planets. The moon, Mercury, Venus, the sun, Mars, Jupiter, and Saturn revolve around Earth.

  • The planets move in little circles that move in bigger circles.

Nicolas copernicus
Nicolas Copernicus

  • Thought that the sun was the center of the universe.

  • His sun-system is called “heliocentric” for the sun. Earth and other planets revolve around the sun.


  • Italian astronomer who was the first scientist to use a telescope to look at objects in the sky.

  • He saw fours moons revolving around Jupiter.

  • He discovered that Venus goes though phases like Earth’s moon.

Tycho brahe
Tycho Brahe

  • Danish astronomer who observed the positions of the planets for about 20 years.

Johannes kepler
Johannes Kepler

  • German mathematician who discovered that the orbit of each planet is an ellipse.

  • An ellipse is an elongated circle, or oval shape.

Isaac newton
Isaac Newton

  • Newton concluded that two factors – inertia and gravity-combine to keep the planets in orbit.

  • Inertia means that a moving object will continue to move in a straight line or a stationary object will remain in plain until some force acts to stop its motion.

  • Gravity pulls the moon towards Earth.