Solar System

• Nebular theory: the solar system originated from a rotating gas and dust cloud composed of hydrogen, helium and some heavier elements
• Ptolemaic Theory: the earth is stationary; each planet and the sun revolved around the earth
• Copernican theory: considers the sun as the center of the solar system
• Terrestrial Planets (Inner Planets): Composed mostly of dense, rocky, and metallic materials; Mercury, Venus, Earth, Mars
• Jovian Planets ( Outer Planets): Composed mostly of Hydrogen and Helium;Jupiter, Saturn, Uranus, Neptune
• Planets: come from greek means wandering star, heavenly bodies revolve around the sun in elliptical orbits.
• Mercury: is the closest planet to the sun
• Venus: brightest and hottest planet, also a twin planet to earth because of its similar size and mass to earth
• Earth: liquid water, life
• Mars: a lot of huge volcanoes; Mons Olympus: biggest volcano in the solar system
• Jupiter: the largest planet in the solar system has a great red spot
• Saturn: the second largest planet, known for its complex rings ; rings made up of rocks, dust particles, colliding moons, etc.
• Uranus: a greenish-blue planet, twice as far from the Sun as its neighbor Saturn
• Neptune: s a stormy blue planet about 30 times farther from the

  Sun than Earth.
• Pluto: is the coldest, smallest, and outermost planet in our solar system
• Asteroid belt: composed of small rocky bodies and comets
• Asteroids: are objects that orbit the sun like planets
• Comets: is a mass of frozen materials such as water, methane and ammonia along with the bits of rock and dust.
• Meteoroids: are objects smaller than the asteroids that revolve around the sun.
• Meteors: a bright tail of light also called a shooting star or falling star
• Meteorites: survives the passage and reaches the earth's surfaces
• Dwarf Planet planetary masses which are neither plants nor natural satellites
• Rotation: spinning of the earth around an imaginary line called the axis
• Revolution: movement of the earth along its orbit
• Solar eclipse: moon moves in between the sun and the earth
• Lunar eclipse: earth is in between the sun and the moon