You will learn how stars are made. You will also learn how stars are your great – – – – – – –great – great – – – – –great – great - grandparents! Hi, kids! The Sun Song (rock version) The Sun Song (classic version)
All stars are “born” in nebulae. A nebula is an enormous cloud of hydrogen and helium gas in space. nebula
One of the “stars” in Orion is actually a nebula click to zoom in
Eventually, protostars give off enough light to be officially called stars Don’t forget – a star is just a big ball of gas! Our sun is just a big ball of gas
This imaginary center is called the “Barycenter” Most stars have a “buddy star” – pairs of stars are called binary star systems X However, you wouldn’t be here without stars...
Every atom in your body was made by a star! “The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, and the carbon in our apple pies were all made in the interior of collapsing stars. We are made of starstuff” – Carl Sagan The atoms of everything in this room, this town, and this planet were created inside a star!
Stars make all the different elements: 3 helium atoms fuse into 1 carbon atom He C
Eventually stars run out of their hydrogen fuel, from the center out This star has no more hydrogen in its center – only in its outer edge. This causes the star’s exterior to expand and cool. This star is now a called a “Red Giant” – “cool” stars are red
Our sun will become a red giant in about 5 billion years
Oh no, the sun will blow up in 157, 787, 999, 999, 999,seconds ! (2,629,800,000,000,000 minutes) (43,830,000,000,000 hours) (1,826,250,000,000 days) (5,000,000,000 years) Assume 365.25 days per year Debug: in presentation mode, start countdown. Then escape from presentation mode. Then return to presentation mode. It will work
M V Mercury and Venus will be destroyed Our sun is currently a “Main Sequence” star – but will grow into a Red Giant! Help! Is it getting hot in here or is it just me? E
After all the fusion stops inside a red giant, the gases float away and only the core remains This core is called a “White Dwarf” This leftover gas is called a “Planetary Nebula”
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