Astronomy

H-R Diagram: Mapping the Stars by Luminosity and Surface Temperature Read! Pages

PowerPoint Project #2 Physical Science AM Block Sign out Laptop responsibly Write down computer # Respect internet agreement on school research only (No shopping, social media, off task surfing) Log Off and Return at period’s end Plug in electricity in proper slot Sign return/in correct computer #

Internet Research Project Type of Stars in the Universe Slide 1

Types of Stars in Universe PowerPoint Slide Show Explain Concept and add picture or diagram. Slide #2 Main Sequence Stars  Explain: How are Main Sequence Stars classified? (Color, temperature, size)  Life Span ( How long do these stars exist?)  Example  Import Picture or Diagram

Main Sequence Stars Slide 2 Energy produced by fusion of hydrogen into helium and heavier elements Most stars are in the main sequence Equilibrium exists between gravity collapsing the star and nuclear fusion exploding the star.

Supergiant Stars Slide 3 Largest stars in universe 10 to 1 Million times bigger than our Sun High mass stars consume all their hydrogen fuel in a shorter time than our sun (“just” a few million years). Detonate as supernova

Giant Stars Slide 4 Low mass stars that deplete their hydrogen fuel at the end of their life span enlarge to “Giant” status. Betelgeuse is a red giant, 20 times bigger and 14,000 times brighter than the Sun.

White Dwarf Stars Slide 5 Stars like Our Sun (low mass) Deplete their hydrogen fuel At the end of their life span and become a White Dwarf. First, the star collapses which heats it up again into a Red Giant for a “short time” ( 1 Billion years – compared to 10 Billion years in its “regular” main sequence life span. Helium (product from fusion) is now transformed into carbon).

Information about STARS Slide 6 How do color and temperature provide important information about stars in the universe? What are the ranges of color? What are the ranges of temperature? Import picture or graph.

Nebula Slide 7 Why are Nebulas so important to the formation of stars? Example (name) Import Picture

Supernova Slide 8 What is a Supernova? Why are they so important to the formation of the larger elements in the universe? Example (name) Import picture