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what's up for April did you know you can

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see other galaxies through modest

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telescopes or binoculars while you can

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hello and welcome I'm Jane Houston Jones

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at NASA's Jet Propulsion Laboratory in

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Pasadena California during 2009 were

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celebrating international year of

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astronomy by taking you on a tour of one

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of the month's best celestial objects

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this month it's the Whirlpool Galaxy

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join me as we step away from our solar

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system look beyond our own galaxy and

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view the spiral arms of another galaxy

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because we are inside our own galaxy

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about two-thirds of the way from the

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galactic core we can't see the whole

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thing but we can see the spiral arms and

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so we know we live in a spiral-shaped

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early astronomers looked up in the night

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sky and saw patches of light which

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appeared like far away clouds they

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called these patches nebula in 1845

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Ireland's third Earl of Ross William

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Parsons used his huge telescope at burr

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castle in the center of Ireland to

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observe and sketch the spiral structure

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of the Whirlpool Galaxy other 18th and

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19th century astronomers including

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father and son William and John Herschel

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noted the structure of this galaxy to a

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galaxy is an enormous collection of gas

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and stars held together by gravity since

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the 19th century astronomers have aimed

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telescopes at galaxies discovering their

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composition in the 20th century NASA's

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orbiting telescopes have looked at this

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amazing galaxy to see it in many

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portions of the electromagnetic spectrum

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from radio to infrared on to visible

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light and past visible to ultraviolet

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x-ray and gamma-ray NASA's Spitzer Space

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Telescope looks at galaxies in the

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infrared part of the spectrum it can see

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long lanes in spiral arms they are stars

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and gas laced with dust the Hubble Space

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Telescope sees similar views in a

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different wavelengths it looks at the

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optical part of the spectrum or what we

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think of as visible light that's the

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light we can see NASA's Chandra x-ray

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Observatory reveals black holes neutron

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stars and a glow between the stars of

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the Whirlpool Galaxy and last but not

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least the galaxy Telescope shows that

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hot young stars produce a lot of

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ultraviolet energy don't forget to view

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Saturn this month either it's higher in

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the sky and easier to see you can read

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all about the Whirlpool and other

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galaxies in the distant universe this

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month on NASA's international year of

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astronomy website astronomy 2009 NASA

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gov and you can learn all about NASA's