Welcome to Earth Science! Unit 6. What is Astronomy?. Astrology.
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Once a hypothesis has been tested multiple timesand generally accepted, it may lead to the development of a theory.
A theory is a hypothesis or a set of hypothesis that is supported by the results of significant experimentation and observation.
When a light source is moving toward an observer, the wavelengths of the light produced are shorter
When a light source is moving away from an observer, the light waves produced are longer.
The shift in the wavelengths of energy emitted by an energy source moving away from or toward an observer is called the
period of extreme and rapidexpansion about13.7 billion years ago.
Formation of Milky Way
Formation of Earth
Origin of Matter
light and heat
Fusion of hydrogen helium
That’s a lot of ENERGY!!!
> 200 year orbit
<200 year orbit
The asteroid belt is a region of space between the orbits of Mars and Jupiter where most of the asteroids in our Solar System are found orbiting the Sun.
Johannes Kepler created three laws of planetary motion:
Newton’s Second Law
The mass (weight) of an object will determine the amount of gravitational forcethat object possesses. The greater the mass, the greater the gravitational force.
States that an objects motion will not change unless that object is acted on by an outside force.
Earth’s Direction of Rotation:
WEST to EAST
Angular Rate of Rotation:
THINK – one complete rotation
360degrees in 24hours
Rate= 3600/24 hours = 150/hour
1. 360 degrees
2. 365 days
3. Rate = 3600/365 days ~ = 10/day
world have about
12 hours of daylight
and 12 hours of night
Movement of Earth around the sun
Once a year
1 degree of orbit/day
Causes seasons and length of day/night
Proof: Parallax (apparent movement of the stars)
The Moon has a rotational period of 27.3 days