Stuff Flashcards
(9 cards)
Rotation Vs Revolution
If it’s not in the notes or hw it wont be on the test
Rotation Vs Revolution
The Earth revolves around the sun
Rotates around it’s axis
The sky looks like it’s moving but really we’re moving the stars are pretty stationary
Seem appear to move’
In the car parked the car next to you backs out and for a split second you feel like you move
That was rotation^
Revolution
When earth reviolves
See certain constalations at night during some parts of the year and then see different constalations during different parts of the year
Were moving around 700mph
1 AU 93 million mph 150 Kph
63,000 mph revolve around sun
Tilt
If it wasnt for the tilt, we wouldn’t have seasons
Ecliptic plane
Cut through the middle of the sun and earth. Other planets are very close to this
Sun going across the -planets
Moon travels almost same travel of sun
Bc move and all planets and stuff
APproximately modeled by the Arc the sun travels thats close to ecliptic plane
Plan revolutoin
Right hand rule
Lefty loosy righty righty
Left is counterclockwise fashion thumb up
Right is clockwise fashion thumb down
Northpole is thumb so it’s counterclockwise the earth rotating
Sun rises in east and sets in west
We have to rotate the opposite way in order to see the sun go from east to west
Earth rotates east which makes the sun look like its going to the west
There ryans belt always rises in the east and sets in the west
The sun isnt exactly east or west
Star of mentaca does menetaca
They can fin d east and west if they can find a ryans belt.
Sun Movement
Sun moves randomly relative to other stars in the local solar neighborhood
- typical relative speeds of more than 70000 km/hr
- stars are so far awar that we cannot easilt norice their motion
Sun orbits the galacy every 230 million years at around 800,000 km/hr
How long…
Distance around galaxy we travel plus velocity
Distance velocity and amount of times
Radias and Diameter
Universal law of gravitation
2 pie R
Sun moves clockwise direction around the galaxy
The book has an image that is wrong 🚩
If the sun was bigger
Mass that we do see onlt calulcate 10% of the value
If the sun was more massive
Distranve was same velovity greater time goes down
T - D divided bt V
Moviung faster in orbit same amount of distance then we would be going less than 365 days
One revolution would take a lot less time
100 miles 50mph t hours
100 miles at 100 miles 1 hour
We move faster because of the gravitational pull. If you drop something it would go a lot faster becuse there would be more force on the earth
The rotation would not be affected we still have 24 hours but our Earth year would be signifcantly greater.
Dark matter
Matter exudes gravitional force
More matter, more force
Matter is like gravity
We dont see the matter but its causing extra gravitional influcen causing things to move a lot faster
Adronoma is gracitationally bound
Adronoma and Milky way is slowly coming closer to eachother
Galaxy spreading apart is happening in general as the universe expands but expections things that are gravitationally bound like earth and adronoma gravitational influence if we were farther to begin with it wouldnt be affected.
Dark matter affects things in the galaxy not the universe
Dark Energy has to do with the universe oooo
Universe Exapanstion
The farther we look out at galaxues (10 billion ly vs 5 billion) The 10 billion is moving away from us at a much faster rate than the 5 billion one. That’s how we know the universe is exanding
(1) ,….. 2 in one hour
(2) 2 now 6 total 4 in one hour
(3)…. 6 in an hour
2,4,6, there’s a rate associated
Hubble constant
Ever sitting still?
Cosmic Speed Limit is the Speed of Light
Something that tmoves faster than the speed of light is possible but not the way the cosmic speed limit is defined; something moving through space
Shotly after the big bang there was
Superlluminal period of expansion where it went faster than the speed of light
Instead of moving thorugh space youre moving the space around us
Instead of going to the door you manipulate the door to move to me lol
words matter “space expands” all means particular things.
