Phy106Quarks-1

Phy106Quarks-1 - What IS Matter ? Matter is all the stuff...

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What IS Matter ? Matter is all the “stuff” around you! Here’s the picture we’re going to uncover (not all today though) Hadrons Matter Matter Leptons Baryons Baryons Mesons Mesons Charged Charged Neutrinos Neutrinos Forces Weak Weak EM EM Strong Strong Gravity Gravity Quarks Anti-Quarks
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We’re going to work our way from the largest size objects which we know about to the smallest size objects which we know about
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Where does all this come from? The universe is a very big place! It is filled with galaxies much like our own, the Milky Way There are likely ~100 billion of them which we can “see”. Each of these galaxies contain around 100 billion stars . Our Milky Way galaxy is simply one of them. Our Sun is just one of the 10,000,000,000,000,000,000,000 stars in the universe! Fig: Small section of the universe, from the Hubble Space Telescope (HST)
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Our Galaxy: The Milky Way How big is the Milky Way (M.W.)? Its radius is about 100,000 light years ! How far is a light year (l.y.) ? It’s the distance light travels in 1 year! Us (Our Solar System) So, 1 l.y. = 5,870,000,000,000 miles (5.9x10 12 mi.) ! So, the M.W. Galaxy radius is about 600,000,000,000,000,000 (6x10 17 ) miles in radius!
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The Center of our Solar System: The Sun At the center of our solar system is our star, the Sun It’s diameter is ~100 times that of the earth , which implies you could fit ~1,000,000 earths inside the sun ! It’s is ~ 330,000 times as massive as the Earth
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The Sun (cont) It is a thermonuclear reactor. Inside the sun, hydrogen is being converted into helium. In this process, energy is released in the form of heat, electromagnetic waves (UV, visible light), neutrinos, etc. It’s surface temperature is ~10,000 O C; other parts of the sun can be as hot as 15,000,000 O C.
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Phy106Quarks-1 - What IS Matter ? Matter is all the stuff...

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