Life of a Star by Stacia Deutsch and Rhody Cohon

LIFE OF A STAR BY STACIA DEUTSCH AND

RHODY COHON

INTRODUCTION Over time

Astronomers invented new tools.

Then they finally, they discover how stars fade from the sky using tools they invented.

BIRTH OF A STAR Scientists divide stars

into different groups called spectral classes.

There are 7 classes: O,B,A,F,G,K and M.

Stars are classified by temperature and by weight, radius, and luminusity, or how much light the star gives off.

NEBULAS All stars begin in

a nebula. Nebulas contain

mainly hydrogen gas and a small amount of helium gas.

Emission nebulas is one of the types of nebula.

NEBULAS Nebula rotates

or spin. Cause-

Protoplanetary disk was here for 10m years

Effect-It disappears after years.

PROTOSTAR The protostar

shoots off its gas jets through its protoplanetary disk.

PROTOSTAR CONTINUES A star’s mass

determines whether it moves on to the next stage

The star also gives off rays of light and energy. A star remains in this main sequence for most of it’s life.

PART OF A STAR All the parts that

stars in this life stage share are: Radiactive zone, convection zone, chromosphere zone, and soicoles zone and corona zone.

PART OF A STAR One of the most

massive stars known today is Eta Carina. Eta Carina is highly unstable.

RED GIANT STAGE Some red giants may

regain stability for a while. Then, they begin the red giant stage a second time.

One day our sun. Like all medium & smaller stars, will become a red giant.

After a red giant has created a Planetary Nebula.

WHITE/BLACK DWARFS Cause-A while

dwarfs are so hot that they still are low. But eventually, white dwarfs cool to temperature sop low.

Effect-They will be in their final life stage,

RED SUPERGIANTS Their gravity

causes the outer layers to colapse inward.

Then, the matter reheats. Nuclear fusion begins again and the stars swells and glows a reddish color.

SUPERNOVAS Supernous blast

gas and debris far into space.

These particles spread out or may form a new nebula.

NEUTRON All neutron stars

rotate, but some also ”twinkle”. Pulsars are spinning neutron stars.

The supernova 1987 A exploded approximately 160,000yrs ago. The light Earth until reach February 23, 1987