March 24, 2014. Remember…. 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?
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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).
1. Where is our solar system located in the Milky
2. How does the Sun’s mass compare with other stars in the galactic neighborhood?
3. How does the distance of the Sun from Earth
compare to the distances of other stars from Earth?
4. How long does it take for light from the Sun to
reach Earth’s surface?
Artistic rendering of the possible shape of the known universe. http://scienceblogs.com/startswithabang/upload/2010/12/whats_in_the_uni verse/WMAP.jpeg