Terrestrials were too small to capture Hydrogen or helium started wo atmosphere

Terrestrials were too small to capture hydrogen or

This preview shows page 1 - 2 out of 2 pages.

other luminous matter. Terrestrials were too small to capture Hydrogen or helium-started w/o atmosphere- gravity=weak Composition - 98% helium and hydrogen, 2% other heavier elements Nebular Hypothesis - In 1755 Immanuel Kant put forth: the Solar System formed from the gravitational collapse of an interstellar cloud of gas. Nebular Theory - Solar Nebula is a giant cold cloud of gas-it has significant mass, and therefore begins to undergo gravitational collapse. Solar Nebula+time+gravity+collision=An orderly solar system Accretion- accumulation of cosmic dust particles into a large object by gravitationally attracting more matter Typically gaseous matter in an accretion disk. Accelerates the growth of particles into boulder-sized planetesimals. Planetesimals - solid objects thought to exist in disks. Theorized that planet formation occurred. Late Heavy Bombardment - LHB- thought that billions of years ago asteroids hit terrestrial planets and the planets accreted them. Structure of Terrestrial Planets- Core-innermost layer, water and solids. Mantle- layer between crust and core Crust- Outermost solid shell- rocky material. Differentiation- Separation of constituents into layers. Dense sank in, light objects came out Meteorite - piece of debris from either an asteroid or comet, survives its impact with earth’s surface. Lunar Maria - large dark spots on Earth’s moons that occurred from ancient volcanic eruptions. “seas” Lunar Highlands - Brighter parts of the moon that are easier to be seen, and are older than the marias. Parts are said to be younger than cratered Ozone- gas that absorbs UV solar radiation about 15-50km above earth’s surface. In stratosphere Greenhouse Gas- gas that absorbs and emits radiation within the thermal infrared range. Greenhouse Effect - Radiation from greenhouse gases heat up a planets atmosphere to warmer than it should Great Red Spot- persistent storm on the planet Jupiter , 22° south of the equator, which has lasted for at least 185 years and possibly as long as 350 years or more Galilean Moons- 4 largest moons of Jupiter- lo-no impact craters lava, Europa, Ganymede, and Callisto. 1 st group of objects found to orbit a planet Photosphere- visible surface of the sun, underneath the opaque layer to which you can start to see visible light Granules- on the photosphere, caused by convection currents of plasma within the suns convective zone.
Image of page 1
Image of page 2

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture