Science Journals 3-18-13

March 24, 2014Remember.What is the smallest particle of matter that still retains all of the properties of that matter?What is in the center of the smallest particle of matter?What surrounds the center?Do you remember that the atom is mostly empty space?What did we explore Friday that is mostly empty space?TEK 8.8BRecognize that the Sun is a medium-sized star near the edge of a disc-shaped galaxy of stars and that the Sun is many thousands of times closer to the earth than any other star.Star - a large ball of gas that generates its own energy by fusing hydrogen atoms to make helium. It is held together by its own gravity. This process emits a tremendous amount of energy, and some of the energy is in the form of light.

Astronomical Unit (AU):The distance between the Earth and the sun (about 150 million kilometers, or 93 million miles).

Wheres The Sun? (wheres waldo?)1. Where is our solar system located in the MilkyWay galaxy?2. How does the Suns mass compare with other stars in the galactic neighborhood?3. How does the distance of the Sun from Earthcompare to the distances of other stars from Earth?4. How long does it take for light from the Sun toreach Earths surface?Your Galactic AddressNorth Ridge Middle School7332 Douglas LaneNorth Richland Hills, TxUSA, North AmericaPlanet EarthSolar SystemMilky Way GalaxyVirgo SuperclusterUniverse

Artistic rendering of the possible shape of the known universe. http://scienceblogs.com/startswithabang/upload/2010/12/whats_in_the_uni verse/WMAP.jpeg Virgo Supercluster

SUNS MASSThe Suns mass is 199 with 28 zeros after it in kg, and its a medium sized star.There are billions and billions of stars in the galaxy.To make writing the mass of these stars easier, the Sun is the frame of reference and the Sun is equal to one solar mass.Smaller stars < one solar massLarger stars> one solar mass

The Sun is also known as Sol (Latin for Sun)13How Long Does it Take for the Light of our Sun to reach us?http://www.universetoday.com/15021/how-long-does-it-take-sunlight-to-reach-the-earth/

The LIGHT-YEARA light-year is a measure of distance. It is not a measure of time.A light-year is the distance that light travels in one year.It is equal to about 6 trillion miles.6,000,000,000,000 miles.Science Journals 3-25-14The light from Alpha Centauri A takes 4.3 years to reach Earth. The light from Ross 154 takes 9.7 years to reach Earth. The light from Luyten 726-8A takes 8.7 years to reach Earth. The light from Procyon A takes 11.4 years to reach Earth. The light from Sirius B takes 8.1 years to reach Earth.What is the order of the following stars from the closest to Earth to the farthest from Earth?Massive StarsOUR SUN IS JUST AN AVERAGE SIZED STAR!There are stars out there much, much bigger

Note down this definition -

Our Sun