life of a star by: stacia deutsch and rhody cohon
TRANSCRIPT
LIFE OF A STAR đ
BY: STACIA DEUTSCH AND RHODY COHON.
INTRODUCTION. đ
⢠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 đŤ
⢠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 â¨
⢠All stars begin a Nebula.
⢠Nebulas contain mainly hydrogen gas and a small amount of helium gas.
⢠Dark nebula clouds are often large.
PROTOSTAR â
⢠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 starâs 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 đĽ
⢠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 STAGEđ
⢠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. â
⢠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 itâs 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 starâs cove.
⢠The iron is too heavy for fusion to continue.
⢠The energy is released as extremely bright supernova
QUESTIONSâ
⢠How do galaxies hold so many stars? (Ch 1-1)
QUESTIONSâ
⢠How do stars seem to twinkle?(Ch 1-2)
QUESTIONSâ
⢠Why do stars come in clusters? (Ch 1-3)
QUESTIONSâ
⢠Why does stars form in hot temperatures? (Ch 1-4)
QUESTIONSâ
⢠How does gravity pull stars closer??(Ch 2-1)
QUESTIONSâ
⢠Why canât astronomers be sure why disk disappear? (Ch 2-2)
QUESTIONSâ
⢠Why canât you be sure when you see a brown dwarf? (Ch 2-3)
QUESTIONSâ
⢠Why are sunspots cool? (Ch 2-4)
QUESTIONSâ
⢠Why is the collection of corona gases surrounded around the sun? (Ch 3-1)
QUESTIONSâ
⢠Why do scientists have to use a special measurement for long distances? (Ch 3-2)
QUESTIONSâ
⢠How do stars get there color? ( Ch 3-3)
QUESTIONSâ
⢠Why arenât all giants red? (Ch 3-4)