Milky+Way,+Universe,+Light+Years

Lauren and Jane - Red Class

Nick D. & Mike G. ~ Orange Class

Milky Way

 * Spiral Galaxy
 * Only galaxy with known life
 * 80,000-100,000 light years in diameter
 * 250,000-300,000 light years in circumference
 * 10,000 lights years thick in the middle
 * Estimated 200 billion stars
 * Solar System's orbit takes 225-250 million years to complete
 * 750 Billion - 1 Trillion Solar masses (mass of The Milky Way)

[[image:http://www.scienceclarified.com/images/uesc_09_img0528.jpg]] ~ (The Big Bang)

 * Our universe is a spiral universe
 * Evidence of evolution for the Universe comes from the Big Bang theory
 * 13.7 Billion years ago (Big Bang)
 * 1 Billion years later: Cosmic Dawn
 * 4.6 Billion Years ago, sun, galaxies, and planets formed

Light Years

 * 1 lightyear = 6 trillion miles (or 9,500,000,000,000 kilometers) - From the Textbook!
 * Practice Problem: If Joe's planet is 9 light years away from Sidney's planet, how many miles away are they?
 * Definition of a light year: Distance light will travel in a vacuum in per year
 * 1 Parsec = 3.26 Light Years
 * Proxima Centauri is the closest star to Earth (besides the sun) at 4.24 Light Years
 * Brightest Star, Sirius, is 8.6 Light Years from Earth

Our Solar System!!

 * In order of distance from the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
 * The Earth is on average about 93 million miles away from the sun
 * The Earth is 91 million miles away from the sun in the winter
 * The Earth is 94 million miles away from the sun in the summer

in inches
 * **10 - Measures of the Planets** ||
 * ||||||||||  |||||||||||||| **Larger Scale Model** ||
 * **Planet** || **True Diameter** in miles || **Diameter**

(50,653 miles/sheet) || **True Distance to the Sun** in miles || **Distance to Sun** in sheets

(50,653 miles/sheet) || **Distance to Sun** in inches

(50,653 miles/sheet) || **Distance to Sun** in feet

(50,653 miles/sheet) ||
 * **Mercury** || 3,032 || 0.267 || 35,983,610 || 710 || 3,197 || 266 ||
 * **Venus** || 7,521 || 0.664 || 67,232,360 || 1,327 || 5,973 || 498 ||
 * **Earth** || 7,926 || 0.699 || 92,957,100 || 1,835 || 8,258 || 688 ||
 * **Mars** || 4,222 || 0.371 || 141,635,300 || 2,796 || 12,583 || 1,049 ||
 * **Jupiter** || 88,846 || 7.658 || 483,632,000 || 9,548 || 42,966 || 3,580 ||
 * **Saturn** || 74,898 || 6.391 || 888,188,000 || 17,535 || 78,906 || 6,576 ||
 * **Uranus** || 31,763 || 2.576 || 1,783,950,000 || 35,219 || 158,486 || 13,207 ||
 * **Neptune** || 30,778 || 2.494 || 2,798,842,000 || 55,255 ||
 * 248,648 || 20,721 ||
 * **Pluto** || 1413 || 0.124 || 3,674,491,000 || 72,542 || 326,441 || 27,203 ||
 * **The Sun's diameter in inches (at this scale) is 76.7 in** ||  ||
 * **The Sun's diameter in inches (at this scale) is 76.7 in** ||  ||

The Sun

 * Could fit over 1.3 million earths inside of it
 * The Surface temperature of the sun is 6,000 degrees Celcius
 * The core of the sun is over 15 million degrees Celcius
 * The sun's diameter is 104-109 times the earth's diameter
 * The solid parts of the sun rotate once every 27 days
 * The diameter of the sun is 870,000 miles

Textbook use:

We used the textbook to convert light years into miles, and we used our class notes to find the average distance of the earth and sun.