Wednesday September 19, 2012 (Properties of Stars; Video – HTUW: Extreme Stars – A Star is Born)

The Launch Pad Wednesday, 9/19/12 What is the trend as stars become larger? What is the trend as stars become hotter?

Announcements None Today

Assignment Currently Open Summative or Formative? Date IssuedDate Due Date Into GradeSpeed Final Day Quiz 2S29/7 9/21 Lab – Timeline of the Universe F49/119/13 WS – Star Stages F59/129/13 Quiz 3S39/14 9/28 Lab – Distance and Spacing of the Planets F69/179/18 Lab – Comparing the Terrestrial and Jovian Planets F79/189/19

?? Recent Events in Science Endeavour Takes Off From Florida on Ferry Flight The Shuttle Carrier Aircraft carrying Endeavour left NASA's Kennedy Space Center this morning en route to Houston, with flyovers of the Florida's Space Coast, NASA's Stennis Space Center and NASA's Michoud Assembly Facility along the way. Endeavour later heads to NASA's Dryden Flight Research Center and then on to Los Angeles, where it will eventually move to the California Science Center. main/index.html Read all about it!

Properties of Stars The Color and Temperature of Stars  Cool Stars  Stars with a temperature less than Kelvins emit longer- wavelength light and appear red.  Medium Temperature Stars  Stars with a temperature between and Kelvins emit medium-wavelength light and appear yellow, like our Sun. Hot Stars  Stars with a temperature above Kelvins emit short- wavelength light and therefore appear blue.

Properties of Stars The Constellation of Orion  Betelgeuse: Temperature - 3,140 to 3,641 K; Distance LY; Radius – 950 to 1200 R  Our Sun: Temperature – 5778 K; Distance - 8 LM; Radius - 1 R  Rigel: Temperature – 12, 130 K; Distance LY; Radius - 74 R Orion nebula star factory

Properties of Stars Binary Stars and Stellar Mass Binary stars are t wo stars orbiting one another and held together by mutual gravitation. Both stars orbit around a common center of mass.

Video Segment How the Universe Works: Extreme Stars A Star is Born