By: Hannah Angela G. Dy GuasoKristen Zakaya C. Zarate

Life of Stars

What stars are

• Huge sphere of hot gas• Produce own light and energy by nuclear fusion. • Fusion happens when lighter elements are forced

to become heavier elements. • Energy is created causing the star to heat up and

shine.

FORMATION OF STARS

Clouds of gas and dust are disturbed by the gravity of a nearby phenomena.

The disturbance causes clumps to form and draw gas inwards

The collapsing clump begins to rotate and flatten into a disc of gas and dust.

The disc rotates faster and faster pulling more material inwards creating a hot, dense core called a protostar

When the protostar becomes hot enough hydrogen atoms begin to fuse, producing helium and energy

After millions of years a bipolar flow erupts from the protostar and blasts away remaining gas and dust

Lifespan of stars• mass of star defines its lifespan. • least massive stars live longest • most massive stars in the Universe use fuel up

in a few million years• biggest stars last only millions• medium-sized stars last billions• smallest stars can last trillions of years.

http://www.universetoday.com/25160/how-long-do-stars-last/

1. Helium fuel runs out2. core will expand and cool3. Upper layers will expand and eject material that will collect around the dying star to form a planetary nebula4. core will cool into a white dwarf and then eventually into a black dwarf.

How stars die

Life cycle of a star

References• http://s.hswstatic.com/gif/how-are-stars-formed-diagram.jpg• http://science.howstuffworks.com/how-are-stars-formed.htm• http://www.universetoday.com/25160/how-long-do-stars-last/• http://wallpapersus.com/wp-content/uploads/2012/07/stars-5.jpg• http://upload.wikimedia.org/wikipedia/commons/4/4a/Cepheus_B.jpg• http://nice-cool-pics.com/data/media/2/

young_stars_emerge_from_orion_s_head.jpg• http://d1jqu7g1y74ds1.cloudfront.net/wp-content/uploads/2010/08/Spitzer-

Uncovers-Star-Hatchery.jpg• http://www.mrwallpaper.com/wallpapers/space-stars-cosmic-nebula.jpg• http://actionforspace.com/wp-content/uploads/2014/04/galaxy-stars-space-

wallpapers.jpg• http://static.tumblr.com/p4blrwv/EESmdci9n/space_stars_3_1920x1200.jpg• http://www.youtube.com/watch?v=4s7vyDLgk3M

Pictures:-http://apod.nasa.gov/apod/image/0211/ngc604_hst_c1.jpg-http://www.buzzle.com/img/articleImages/319130-25826-48.jpg-http://images.latinospost.com/data/images/full/4301/nasa-handout-image-of-the-sun.jpg-http://www.redorbit.com/media/uploads/2013/02/121915394-617x416.jpg-http://i292.photobucket.com/albums/mm33/MiniIceGoddess/Space.jpg-http://megahdwallpapers.com/wp-content/uploads/2011/03/black-hole-in-space-wide-monitor-wallpaper.jpg

References