Astronomy Class 11.docx - Astronomy Class 11 Radio and...

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Astronomy Class 11Radio and Space TelescopesRadio Astronomy-Earth receives radiation from radio waves-Radio window wider (1nm – 10m) than visible window-Other galaxies emit radio waves too-Galaxies have supermassive black holes at center produce radio emission-Dark regionsAbsent of stars Emit radio wavesSpace between stars low density diffuse gas (gas source of radio waves)Radio Telescopes -Similar to optical reflecting telescopes-Curved metal dish collect radio waves focus them onto receive at focus pointSignal processed by computer -Require large size because radio source from space faint need large collecting areas-Radio dish don’t need to be as smooth as optical mirrorAdvantages of Radio Astronomy -Not limited to night time -Clouds, rain, snow don’t interfere -Observations different wavelength Gives totally different info than optical telescopes-Map gas clouds around objects -See through dusty areas that obscure other forms of radiationGives commentary observations -Shorter wavelengths more likely to be absorbed by gas/dust than longer wavelengths See through dense regions of spaceOrion Nebula in Visible and Radio

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Term
Fall
Professor
N/A
Tags
Planet, Electromagnetic spectrum, Dwarf planet, radio telescopes, Rays

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