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what's up for july hello and welcome i'm

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jane houston jones at nasa's jet

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propulsion laboratory in pasadena

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california

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2009 is international year of astronomy

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and each month this year we're

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showcasing a great celestial object this

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month it's our milky way galaxy

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galileo aimed his telescope towards some

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of the fuzzy patches of our galaxy and

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discovered they were made of stars

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using ptolemy's second century catalog

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of stars as a starting point he observed

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several well-known star clusters like

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the beehive cluster

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and the pleiades

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ptolemy had identified the six brightest

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stars in the pleiades but galileo saw 36

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stars through his telescope he drew the

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stars using four different sizes to

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distinguish their different brightnesses

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and he published his findings in 1610

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through the next two centuries

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astronomers used bigger and bigger

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telescopes to study and map the milky

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way galaxy

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they observed nebulae clusters and even

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areas where no stars could be seen

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today spacecraft and orbiting telescopes

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joined ground-based observers to learn

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more about our galaxy

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issa's recently launched herschel

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mission will explore the earliest stages

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of star and galaxy birth in the universe

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and will help answer questions about how

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our own sun and milky way galaxy came to

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be

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the spitzer space telescope created the

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most detailed infrared picture of our

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galaxy ever made

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and chandra's images of the central

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region reveal white dwarf and neutron

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stars and black holes in a fog of hot

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gas

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from a dark sky you'll see the milky way

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rising in the east and spanning the sky

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from north to south after 10 pm local

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time back in our own solar system look

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for saturn near the western horizon

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and look for jupiter rising in the east

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about 10 o'clock as the milky way spans

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the sky

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you can learn all about nasa's missions