Earth Science 2a

Universe

everything that exists

Galaxies

billions of stars and planets held together by graviy

Three different forms of galaxies

Spiral, Irregular, and Elliptical

Our galaxy is shaped as a ___ and is ___ billion years old

elliptical; 13.2 billion years old

Solar system

a grouping of planets, comets, and asteroids that revolve around a star

How old is our solar system?

4.6 billion years old

Classification of our Universe from Biggest to Smallest

Planet - Solar System - Galaxy - Universe

Formation of our solar system

A cloud of gas and dust form to be called a nebula. Gravity pulled the material together, which caused the sun to be in the center. The leftover gas and dust clumped together to form planets, moon and other objects.

Sun

the star that our solar system revolves around

Planets

8 planets, large objects to orbit the sun

Dwarf Planets

smaller, planet like objects, that have not fully cleared their orbit

Asteroids

Solid, rocky and/or metallic body that orbits the sun. Mostly between Mars + Jupiter

Moon

Earth’s natural satellite that revolves around the Earth

Comet

“dirty snowball” composed of solids that change to gas when heated

Meteorites; what are they called when they enter + land

A small solid fragment that orbits the sun

enter - meteors

land - meteorites

Inner planets

mercury, Venus, earth, mars (MY VERY EAGER MOTHER)

Asteroid belt

in between mars and Jupiter

contains Pallas, ceres (+ asteroids)

Outer planets

Jupiter, Saturn, Uranus, Neptune (JACOB SITS UPON NUTS)

Kuiper Belt

located after Neptune

Eris and Pluto

Rocky Asteroids, Comets, etc. 

Terrestrial Planets (Inner planets)

Closer to the Sun

Rocky

Smaller

More Dense

Jovian Planets (Outer Planets)

Farther from the Sun

Gassy

Bigger

Less dense

Impact craters

formed by collision of asteroids, comets, meteors with another celestial body

The way a star ends depends on their …..

size