space exploration & astronomy today
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Space Exploration & Astronomy Today. These careers are just… out of this world!. Think about what astronomers do Draw a picture or two of an astronomer at work on a typical work day / night Be sure to include a short caption! Be prepared to share your work with others. Activity Time!. - PowerPoint PPT PresentationTRANSCRIPT
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Space Exploration & Astronomy Today
These careers are just…
out of this world!
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Activity Time!
• Think about what astronomers do
• Draw a picture or two of an astronomer at work on a typical work day / night
• Be sure to include a short caption!
• Be prepared to share your work with others
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What Did You Draw?
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What ClipArt Had to Draw
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Is That Drawing Accurate?
• Astronomers spend only a few night per year observing– Typically, less than 5– Many astronomers don’t even use telescopes
• Astronomers never look through telescopes– Eyes aren’t sensitive or objective enough for
astronomy– Eyes don’t create a permanent, reproducible copy of
what they see– No research observatory in the world has a telescope
with an eyepiece
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Can Astronomers…
• Take a star into a lab and dissect it?
• Make a solar system by combining chemicals in test tubes?
• Send instruments to the inside of the Sun or planets?
• Watch a star like the Sun evolve over its 10,000,000,000 year lifetime?
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The Six Tools of Astronomers
1) ???????
2) Computers
3) Spectrometers
4) Spacecraft
5) Space Telescopes
6) Earth-bound telescopes
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The Six Tools of Astronomers
1) ???????
2) Computers
3) Spectrometers
4) Spacecraft
5) Space Telescopes
6)Earth-bound Telescopes
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Earth-Based Telescopes
• Use mirrors, not lenses– Why not lenses?
• Collect light for a CCD (digital camera)
• Often located on remote mountaintops close to the ocean– Why might locations like
that be preferable?
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Earth-Based Telescopes Cont.
• Not all Earth-based telescopes are designed to study visible light– But only radio, visible,
and some infrared can be seen through the atmosphere
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The Six Tools of Astronomers
1) ???????
2) Computers
3) Spectrometers
4) Spacecraft
5)Space Telescopes
6) Earth-bound telescopes
![Page 12: Space Exploration & Astronomy Today](https://reader035.vdocument.in/reader035/viewer/2022062309/56815123550346895dbf415e/html5/thumbnails/12.jpg)
Space Telescopes
• Costs $50,000/lb. to launch into space
• Why would astronomers pay so much just to put a scope into space?– No cloudy weather– Can observe waves
normally blocked by the atmosphere
– No turbulent air; high resolution
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The Six Tools of Astronomers
1) ???????
2) Computers
3) Spectrometers
4)Spacecraft5) Space Telescopes
6) Earth-bound telescopes
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Spacecraft
• Cost $50,000/lb. to launch into space• Extremely close-up views• Can analyze rocks on the surface of objects
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Spacecraft Limitations
• At 38,000 mph, how long would it take to go to the Moon? (238,000 miles)
• How long to Venus? (25,000,000 miles)
• How long to Pluto? (3,000,000,000 miles)
• How long to the nearest star? (25,500,000,000,000 miles)
• Obviously, spacecraft are limited to studying Solar System objects
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The Six Tools of Astronomers
1) ???????
2) Computers
3)Spectrometers4) Spacecraft
5) Space Telescopes
6) Earth-bound Telescopes
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The Electromagnetic Spectrum
• Consists of all electromagnetic waves• Only some waves are visible to human eyes• Detectors of other waves have been invented
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Spectral Lines
• Each element emits/absorbs light at specific wavelengths
• Can use these lines to determine which elements are present
• Can also be used to measure the Doppler effect
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Spectroscopes
• Use prism or diffraction grating to separate EM waves by wavelength
• Can then measure position, width, and intensity of spectral lines– Lots can be figured out from spectral line measurements
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Which Element is in the Tube?
Hydrogen
Helium
Carbon
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The Six Tools of Astronomers
1) ???????
2)Computers3) Spectrometers
4) Spacecraft
5) Space Telescopes
6) Earth-bound telescopes
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Computers
• Can simulate various processes– Long time frames– Huge scales– Interior of stars / planets
• Can make predictions based on models
• Can perform numerous & complex calculations
• Can procrastinate via AIM, Facebook, MySpace…
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The Six Tools of Astronomers
1)???????2) Computers
3) Spectrometers
4) Spacecraft
5) Space Telescopes
6) Earth-bound telescopes
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A Science Education!!!
• Most astronomy is done by analyzing the physics and chemistry involved
• Math and computer skills are also frequently used frequently– What examples from this
unit can you see physics used?
– Chemistry?– Math?– Any other sciences?
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Astronomy Major at VU• 24 credits Physics
– including 4 credits labs
• 16 credits Math• 8 credits Chemistry
– including 2 credits labs
• 7 credits Astronomy– including 4 credits labs
• 8 credits Computer Language (recommended)