# Solar System

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### Geocentric Model

Earth is at center of solar system

### Heliocentric Model

Sun is at center of solar system

### Copernicus

Astronomer who proposed heliocentric model

### Ptolemy

Astronomer who proposed the geocentric model

### Kepler

Had three laws of planetary motion

### Kepler's first law of planetary motion

The orbit of planets is an ellipse

### Kepler's second law of planetary motion

If you increase the distance from the sun, the planet moves slower.

### Kepler's third law of planetary motion

If you increase the distance from the sun, it will increase the time to move around the sun.

### Newton's 1st Law of Motion

If an object is moving at a constant speed, then it will continue to move at constant speed unless acted upon by an outside force.

### Newton's 2nd Law of Motion

Acceleration = F/M

### Newton's 3rd Law of Motion

For every action, there is an equal and opposite reaction.

increase

increase

decrease

### Mass

Amount of matter in an object

### Weight

The force of gravity on an object

A = F/M

v

### Would you weigh more or less on a planet with a smaller mass?

less because the planet has a smaller gravitational pull on you than earth

### Planets that weigh more

Jupiter, Saturn, Neptune

### Planets that weigh less

Mercury, Venus, Mars, Uranus

ellipse

Neptune

### Neptune has the slowest speed because

it has the weakest gravitational attraction between the sun and planet.

Mercury

### Mercury has the fastest speed because

it has the strongest gravitational attraction between the sun and the planet

### Four inner planets

Mercury, Venus, Mars, Earth

### Four outer planets

Saturn, Jupiter, Uranus, Neptune

### Difference between inner and outer planets

The inner planets are small, solid, and have no rings. The outer planets are large, gaseous, and have rings

### Location of asteroid belt

Between Mars and Jupiter

### Location of Kuiper Belt

Outside Neptune's orbit

Pluto

### Meteoroid

Rock or fragment traveling in space

### Meteor

Meteoroids pass through atmosphere

### Meteorite

Meteoroid reaches Earth's surface

### Difference between meteoroid, meteor, and meteorite

The location of the object

### Crater

Large hole at the Earth's surface created by a meteorite or asteroid

### Kuiper Belt

Comet or ecliptic plane

### Oort Cloud

Further long period comets

### decreases

If the two objects move further apart, what happens to the force of gravity between the two objects?

Decrease

Example:

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