Solar System
Greeks thought the sun revolved around the earth, because they didn’t math
Ptolemy did some shit with complicated spheres that I don’t care about
Copernicus put the sun in the centre like it’s supposed to be
Galileo made telescopes, the long type. He discovered the Jupiter moons and the moon has craters on it.
Brahe was the guy with OCD who did precise things and measure them
Kepler took brahe’s notes and made sense of them using math. Orbits are ellipses, not circles, orbits speed up closer to the sun... because gravity
Newton did his thing with gravity, gravity depends on mass and distance. Mass has to be big to be important.
Sun Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
First 4 are rock, last 4 are gas
AU is 150 million km, Jupiter is 5 away Saturn is like 9.5 AU away. Fuck that’s far.
Rotate, to spin on an axis
Revolve, orbit an object
Solar plane is the plane is the nifty ring were all orbiting on
The Sun
99% of the mass in the system, 1 million earths big, Mostly hydrogen, plasma cuz of heat and pressure The parts of the sun are: core, radiative core, convection zone, photosphere, chromospehere corona
Core is 15 million, next one is 8, zone drops to a 1.5, photosphere is 6k, chromo is 20k, corona is a million
Earth formed through aggloramation (little rocks hitting together) heavier metals sunk to the bottom once collisions got big enough to melt things
Moon came along, most likely theory is random planet came and hit earth, all the stuff that got blasted off turned into moon. Thats why its lighter and less dense.
Two types of eclipses, solar and lunar, solar is when the moon blocks the sun, pretty nifty. Lunar is when earth blocks the sun from the moon, so it looks all red. Partial shadow is penumbra, full shadow is umbra, these sound like pokemon. 7k km and 270 km each.
Tides! Moon and earth pull on each other. High tide is the side the moon is on, and the opposite side too. Sun moon and earth line up, even more tides . on perpendicular sides, less tides.
Comets! They are ice balls. Really elliptical orbits. Edge of the solar system. Get close to sun, melt and make tail.
Asteroids are solid rock masses up to 1k km across. In the belt.
Meteor – meteorite – meteoroid
Meteor is when they’re in atmosphere; meteorite is when they’re in the ground
Holy shit there’s more
Stars
One tenth to ten times the sun, for main sequence
Life cycle – nebula, clouds of dust, begins to concentrate. Once pressure is high enough they begin to fuse and ignite. Gravity in, fusion out! Balance J
They then expand to a red giant. outer layers get blown away eventually. That means a white dwarf. Iron core absorbs energy then it explodes. More splosions. Neutron star forms. They spin really fast pulsars.
My god theres exploration now. This unit is long as fuck
Telescopes, refracting and reflecting. 2nd is better.
Electromagnetic spectrum
Theres a lot of radiation i don’t think ill ever have to learn.
Radio telescopes pick up all the radiation that starts emit. Red shift and blue shift. Red is away blue is towards. All we ever need.
Galaxies are quite large. Discovered in 1929 because we couldn’t figure it out earlier . 80k light years away. Spiral elliptical or irregular, i might be dying of dehydration
Solar wind makes auroras cuz of magnets. Its really fast 150 k/s
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