Solar System. Geocentric = Earth (geo) is center of universe Heliocentric = Sun (helio) is center of universe Which is correct? Heliocentric… proved by Copernicus and Galileo. Solar Nebula Theory. How to make a solar system : Start with nebula = a large cloud of dust and gas.
Geocentric = Earth (geo) is center of universe
Heliocentric = Sun (helio) is center of universe
Which is correct?
Heliocentric… proved by Copernicus and Galileo.
How to make a solar system:
ie: pizza, skirt on spinning ice skater.
3. The middle of the disk reaches high temp. and ignites!
Nuclear Fusion = when lighter elements combine into heavier elements (Hydrogen + Hydrogen = Helium)
4. Voila… a star is formed.
Dust and rocks begin to clump together… like a snowball = accretion.
Planetesimals = objects size of small moons with gravitational fields.
Differentiation = dense materials sink to form core, light materials float and form crust.
3. Cleared the “neighborhood” around its orbit.
Mercury, Venus, Earth and Mars.
-- Rocky surface
-- Small diameter
-- High density
-- Few moons
Jupiter, Saturn, Uranus and Neptune.
-- No surface
-- Large diameter
-- Low density
-- Many moons
Pluto resides in Kuiper Belt.
In 2005, Eris (same size as Pluto) found in Kuiper Belt.
Pluto does not clear out its orbit
Region located 30 to 55 AU (past Neptune).
1,300 objects discovered so far.
May have over a trillion comets and 200 dwarf planets.
All planet have elliptical (oval) orbits.
Eccentricity = how flat
Circle = 0 eccentricity
Line = 1 eccentricity
Aristotle = heavy objects fall faster than light objects.
Kepler = laws of planetary motion (didn’t know cause).
Galileo = first to test “how objects fall” (didn’t know cause).
Gravity is a force.
From Galileo’s ideas he determines that the moon is falling into Earth, but keeps missing it (orbit).
Thought experiment – gravity cannon.
Rocky and Metallic objects that orbit the sun.
Most located between Mars and Jupiter.
Periodically destroy all life on Earth.
Ball of dust and ice that revolves around the sun.
Most come from Kuiper Belt and Oort Cloud… very far from Sun.
Exoplanet = planet orbiting another star.
Over 1,075 confirmed so far.
First rocky planet found.