Chapter 1 blanks + extra notes
slide one blank=collection
slide one blank 2= ordinary
on a scale model of our solar system the earth is about 1 foot, and the moon is a quarter.
the moon is about 30 million miles from earth and takes days to get there by fastest rocket.
The sun is 110 times the size of earth and about 2 earth miles away
(earth globe is 30ft from moon to scale and less than 2 miles from sun)
The milky way is a spiral galaxy containing 100-400 billion stars
speed of light=300,000km/s=186,00 mi/s
-7 times around earth 1/7th of a second
light-year measures the distance light travels in one year
1LY= 9.5 trillion km
WE ARE STARDUST
most natural phenomena occurrence
we use telescopes
Scientific method= start with idea/observation-suggest a hypothesis- make a prediction-
test falsifies hypothesis, created a new one- perform test
, falsifiable (ability to be proven wrong)
This is how science makes progress
physical law: a theory that has become very well tested and is of fundamental importance
existing, accepted ideas are allowed to be (and should be) challenged via the scientific
method
Another way of thinking about it: "there is nothing special about our place in the universe"
Occam’s razor all things being equal, the simplest explanation is true
Math and graphs can describe and predict relationships
scientific notation is a convenient way of expressing very large or very small numbers using
powers of 10(2.0x10^24 20=septillion)
Astronomy is an ancient science
Ask "what if?"
Astronomy is the study of the universe
Chapter 2 notes
earth rotates counterclockwise viewed from above
1 rotation (relative to the sun)=24 hours
objects seem to move east-west
slide one blank=collection
slide one blank 2= ordinary
on a scale model of our solar system the earth is about 1 foot, and the moon is a quarter.
the moon is about 30 million miles from earth and takes days to get there by fastest rocket.
The sun is 110 times the size of earth and about 2 earth miles away
(earth globe is 30ft from moon to scale and less than 2 miles from sun)
The milky way is a spiral galaxy containing 100-400 billion stars
speed of light=300,000km/s=186,00 mi/s
-7 times around earth 1/7th of a second
light-year measures the distance light travels in one year
1LY= 9.5 trillion km
WE ARE STARDUST
most natural phenomena occurrence
we use telescopes
Scientific method= start with idea/observation-suggest a hypothesis- make a prediction-
test falsifies hypothesis, created a new one- perform test
, falsifiable (ability to be proven wrong)
This is how science makes progress
physical law: a theory that has become very well tested and is of fundamental importance
existing, accepted ideas are allowed to be (and should be) challenged via the scientific
method
Another way of thinking about it: "there is nothing special about our place in the universe"
Occam’s razor all things being equal, the simplest explanation is true
Math and graphs can describe and predict relationships
scientific notation is a convenient way of expressing very large or very small numbers using
powers of 10(2.0x10^24 20=septillion)
Astronomy is an ancient science
Ask "what if?"
Astronomy is the study of the universe
Chapter 2 notes
earth rotates counterclockwise viewed from above
1 rotation (relative to the sun)=24 hours
objects seem to move east-west
