WARM UP What two things determine the strength
- Slides: 21
WARM UP What two things determine the strength of an object’s gravitational force?
How do scientists theorize the formation of planets? What are moons? PLANETARY FORMATION AND MOONS!
Review Gravity is the force that pulls objects toward each other. The strength of gravitational force depends on the MASS of the object DISTANCE between the objects
MASS 100, 000 kg 100 kg
DISTANCE STRONG GRAVITATIONAL FORCE WEAK GRAVITATIONAL FORCE
The Formation of a Planet 1. A star supernovas (explodes) and sends off HUGE amounts of dust and rock. 2. The gravitational force of a large rock pulls in smaller rocks and dust. 3. The new planet continues to “grow” until no more rocks and dust are left around it. http: //www. youtube. com/watch? v= _mc. C 8 k. Facrk&feature=related
What is a solar system and what are the characteristics of ours? SOLAR SYSTEMS
Review Outer space contains planets, stars, natural satellites (moons) asteroids, meteoroids, and comets.
Solar Systems A solar system is a collection of celestial bodies (planets, moons, asteroids, etc) orbiting a star.
Our Solar System Our solar system contains 1 star (the Sun) 8 planets 240 known moons Comets (giant balls of ice) Asteroids (flying space rocks) Meteoroids (small asteroids)
The Formation of a Planet Gravity holds a planet together in a spherical (round) shape.
Types of Planets
Types of Planets The two types of planets are Terrestrial Planets – Rocky planets with a solid surface (examples: Earth, Mars, Mercury) Gas Giants – Giant planets made mostly of gas (examples: Jupiter, Saturn, Uranus)
Terrestrial Planets The 4 planets closest to the Sun are terrestrial planets (aka: rocky planets or inner planets). Mercury Venus Earth Mars
Asteroid Belt The asteroid belt is a huge area containing asteroids and meteoroids located between the inner and outer planets.
Gas Giants The 4 planets furthest from the Sun are Gas Giants (aka: Jovian/outer planets). Jupiter Saturn Uranus Neptune
The Kuiper Belt The area surrounding our solar system composed almost entirely of comets.
Planetary Satellites A planetary satellite is a natural object that orbits (revolves around) a planet due to gravity. Also known as a MOON. Planets don’t always have moons. Some planets have many moons.
Phases of the Moon The phases of the moon occur because of the moon’s revolution around Earth. The lit portion of the moon that we see changes depending on the position of the moon around Earth.
Planets Memory tip: “My Very Excellent Mother Just Served Us Nachos. ”
EXIT SLIP What are the two different types of planets? What is the major difference between the inner and outer planets in our solar system.
