Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
JAXA/SAO/NASA/NAOJ Trish Jibben Smithsonian Astrophysical Observatory Cambridge,MA Astronomy Picture of the Day (February 21, 2007) What are Stars? • Balls of gas burning billions of miles away… SOHO (NASA) EIT (NASA) MDI (NASA) EIT (NASA) B o r n Grow M i d d l e A g e Old Stars change as they get older Just like people But they change Slowly… MDI (NASA) B o r n Grow M i d d l e A g e HST (NASA) Old Stars are different sizes White Dwarf Stars are Hot! • The color of a star tells you how hot they are. Hot Cool Hottest stars can get to be 90,000 degrees fahrenheit! Cool stars are about 5,000 degrees Fahrenheit Astronomy Picture of the Day July 20, 2006 Some stars are close together HST (NASA) HST (NASA) Some stars that look close are really far apart Some are VERY close! HST (NASA) Stars are moving! Stars Rotate Stars move through space but it takes a long Time to see them move QuickTime™ and a Video decompressor are needed to see this picture. XRT (JAXA/SAO/NASA/NAOJ) Why do stars look like dots? Close up the statue of liberty looks big! If you move away from it. It begins to look smaller… Hellicopter Airplane Stars look like small dots because they are very, very, VERY far away. Space Station The sun is brightest star in the sky -because we are close. Because we are so close to the sun the light is really bright and fills the whole sky up with light! Daylight! SOHO (NASA) Questions • What would the sun look like if it were far away? • What would stars look like if they were close? • Because the sun is so close we have to use special telescope to see it. • Because other stars are so far away we have to use telescopes to see them too!