Stars

Graduation Requirements
Earth and Space
Equipment/Materials Needed
Access to a telescope

stars
Description
As old as the universe itself, Those tiny little bright spot in the night sky, what are they and where do they come from?





Badge Completion Requirements

Stars (HS-ESS1-2)

A huge ball of gas held together by gravity. The central core of a star is extremely hot and produces energy. Some of this energy is released as visible light, which makes the star glow. ... Our Sun, the center of our solar system, is a yellow star of average temperature and size.

 

https://sciencing.com/science-project-life-cycles-stars-12176065.html

Prompts

Explain how a star's mass determines not just how long it lives, but also how it dies.

 

Please develop and submit a presentation demonstrating your understanding of stars. Please include the above "prompts" in your presentation

 

 

 

 

 

Main Star Sequence

Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main-sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. Stars start their lives as clouds of dust and gas.

H-R diagram

Most stars are found in the main sequence area of the H-R chart. Stars spend much more of their lives burning hydrogen in their cores than they do produce energy in any other way! Sirius A, only 8.6 light-years from Earth, is the fifth closest star system known. About 90 percent of the stars in the universe, including the sun, are main-sequence stars. ...Stars start their lives as clouds of dust and gas.

Steps in the formation of a star:

Life Cycle of a Massive Star: 

Step 1 - Green - A cloud of gas and dust collapses due to gravity, creating a protostar. 

Step 2 - Blue - Gravitational energy powers the young star until... 

Step 3 - Yellow - …nuclear fusion occurs. The main sequence star may live millions or even billions of years. 

Step 4 - Red - The star expands into a red giant when the star's hydrogen level drops. 

Step 5 - Orange - Different fusion processes occur. The star expands, cools, and loses mass each time. 

Step 6 - White - Fusion stops and a supernova explosion occurs. Most of the star is blown away. 

Step 7 - Black - Depending on the original star’s mass, either a black hole or neutron star remains. 

Step 8 - Green - The material shed during the star's life joins new gas clouds, and new stars are formed

Prompts

Discuss the composition of stars

Explain the formation of starts

Summarize the life stages of a star

H-R Diagram, What does the h & r represent

Where is our Sun located on the H-Diagram

How do stars produce light

Please develop and submit a presentation demonstrating your understanding of how stars are formed and the H-R Diagram. Please include the above "prompts" in your presentation

Formation of a Black Hole

A black hole is a region of spacetime exhibiting gravitational acceleration so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.

Anyone interested in space needs to follow: 

 

https://hubblesite.org/

 

According to theory, there might be three types of black holes: stellar, supermassive, and miniature black holes – depending on their mass. These black holes would have formed in different ways. Stellar black holes form when a massive star collapses.

 

Prompts

Discuss how black holes are formed

Explain how we know black hole exist

Please develop and submit a presentation demonstrating your understanding of black holes. Please include the above "prompts" in your presentation