Post on 31-Dec-2015
LIFE OF A STAR 🌟
BY: STACIA DEUTSCH AND RHODY COHON.
INTRODUCTION. 📕
• Constellations are grouplings of stars.
• Stars gather in groups called galaxies.
• Our solar system is compromised of everything that orbits the sun like planets.
BIRTH OF A STAR 💫
• The unaided human eye can see only a few thousand stars at a time.
• The spectral class types for stars are labeled O,B,A,F,G,K, and M.
• To sort stars, scientists look at their temperatures.
• Our sun is a class G yellow star.
BIRTH OF A STAR ✨
• All stars begin a Nebula.
• Nebulas contain mainly hydrogen gas and a small amount of helium gas.
• Dark nebula clouds are often large.
PROTOSTAR ⭐
• During this phase a new star is called a protostar.
• The energy creates large, powerful jets of gas called bi-polar outflow.
• Sometimes stars form in clusters.
MAIN SEQUENCE OF A STAR.
• A star’s mass determines whether it moves on to the next stage.
• A main sequence star develops a core temperature of millions of degrees.
• As long as the star stays in equilibrium, it will remain a main sequence star.
PARTS OF A STAR 💥
• It takes about 170,000 years for them to make it out of the star.
• Sunspots are dark, cool areas on the photosphere.
• Solar flares are sudden, violent explosions on the sun.
RED GIANT STAGE🌅
• Most red giants are red but others can be orange or yellow.
• Aledebaran, a red giant is one of the brightest stars in the night sky.
• Some red giants may regain stability for a while.
CONVECTIVE ZONE.
• This layer is less dense and cooler than the radioactive zone.
• It takes a single photon only about ten days to reach the next level.
• These convection currents make the surface of the next level.
CORONA.
• The temperature of the corona averages 3.5 degrees. ☀
• This is the collection of gases around the sun.
• It is much hotter than the core.
NUCLEAR FUSIONS.
• Nuclear fusion creates very light, nonelectric charges called neutrinos.
• By studying these neutrinos, scientists learn about fusion inside the stars.
• A proto star cannot begin nuclear fusion without enough mass or heat.
DEATH OF A STAR
• Star enters it’s final life stages as it runs out of fuel.
• Without, fuel a star cannot perform the same amount of nuclear fusion as it once did.
• It cannot stay in equilibrium.
WHITE DWARFS
• A white dwarf temperature slowly cools down over the next billion years.
• It emits very little light.
• At first, white dwarfs are so hot that they still glow.
BLACK DWARFS
• There are no known black dwarfs in our universe.
• All that will remain is a black lump of carbon, known as a black dwarf.
• Scientists think it takes so long for a while dwarf to cool, that no black dwarfs have been created yet.
RED SUPER GIANTS..
• Red super giants begin to die like red giants do.
• Their gravity causes the outer layers to collapse inward.
• Unlike red giants, stellars winds are common and strong on a red super giant.
SUPERNOVAS
• A supernova is caused in the star’s cove.
• The iron is too heavy for fusion to continue.
• The energy is released as extremely bright supernova
QUESTIONS❓
• How do galaxies hold so many stars? (Ch 1-1)
QUESTIONS❓
• How do stars seem to twinkle?(Ch 1-2)
QUESTIONS❓
• Why do stars come in clusters? (Ch 1-3)
QUESTIONS❓
• Why does stars form in hot temperatures? (Ch 1-4)
QUESTIONS❓
• How does gravity pull stars closer??(Ch 2-1)
QUESTIONS❓
• Why can’t astronomers be sure why disk disappear? (Ch 2-2)
QUESTIONS❓
• Why can’t you be sure when you see a brown dwarf? (Ch 2-3)
QUESTIONS❓
• Why are sunspots cool? (Ch 2-4)
QUESTIONS❓
• Why is the collection of corona gases surrounded around the sun? (Ch 3-1)
QUESTIONS❓
• Why do scientists have to use a special measurement for long distances? (Ch 3-2)
QUESTIONS❓
• How do stars get there color? ( Ch 3-3)
QUESTIONS❓
• Why aren’t all giants red? (Ch 3-4)