trish jibben smithsonian astrophysical observatory cambridge,ma jaxa/sao/nasa/naoj
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Trish JibbenSmithsonian Astrophysical Observatory
Cambridge,MA
JAXA/SAO/NASA/NAOJ
Astronomy Picture of the Day (February 21, 2007)
What are Stars?
•Balls of gas burning billions of miles away…
SOHO (NASA)
MDI (NASA)
EIT (NASA)
EIT (NASA)
Born
GrowMiddle Age
Old
Born
Grow
Middle Age
Old
Stars change as they get older Just like people
But they changeSlowly…
HST (NASA)
MDI (NASA)
Stars are different sizes
White Dwarf
Stars are Hot!
• The color of a star tells you how hot they are.
Hot Cool
Cool stars are about 5,000 degrees Fahrenheit
Hottest stars can get to be 90,000 degrees
fahrenheit!
Astronomy Picture of the Day July 20, 2006
Some stars are close together
Some stars that look close are really far apartHST (NASA) HST (NASA)
Some are VERY close!
HST (NASA)
Stars are moving!
Stars Rotate
QuickTime™ and aVideo decompressor
are needed to see this picture.
Stars move through space but it takes a longTime to see them move
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!
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