Explain why the radio horizon is at greater distance than the optical horizon.
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Explain why the radio horizon is at greater distance than the optical horizon.
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- Geostationary satellites cannot be seen in a telescope from Albany because they are always directly over the Equator. True FalseUse Wien's Law to calculate the peak wavelength of light coming from the Sun. Assume T=5800 K for the surface temperature of the Sun. Wein's displacement law says that the blackbody temperature and peak wavelength multiplied together give a constant of 0.29 cm-K. (K is degrees Kelvin).How can astronomers observe through these dusty clouds? What can possibly happen in these clouds in millions of years?
- Cas A SNR North Lobe Chandra ACIS image (M. Stage) region of spectrum-> 10* km/s (be sure to convert your answer to kilometers!) (Enter a positive value--if you get a negative answer ignore the minus sign.) 1000 100 Combine counts / Ang./ (0.964324 sq. arcsec) 10 1 0.1 Cas A Ms Spectrum from 4362.5 4458.5, region size 0.964324 sq. arcsec Silicon line werden der 5 10 20 Wavelength (Angstroms) The speed of the material ejected in a supernova can be measured by using the Doppler shift of the X-ray emission lines in its spectrum. The images above show real X ray data of the Cassiopeia A supernova remnant and a spectrum extracted from that data--you can see several emission lines including the silicon line near 6.6 angstroms (0.66 nm). If the emission line created by silicon normally has a wavelength of 0.6648 nm (nanometers), but is measured in the spectrum to have a wavelength of 0.6599 nm, how fast is the gas moving?The total energy stored in a radio lobe is about 1053 J. How many solar masses would have to be converted to energy to produce this energy? (Hint: Use E = mc2. Note: One solar mass equals 2.0 1030 kg.)Using this equation Wein's Law: What is the wavelength of maximum intensity and the total energy emitted by a celestial object at absolute zero?
- What kind of object is the Messier Object M42, and where is it in the sky?If Star A's temperature is 5000 K and Star B's wavelength of peak emission is 5/7 as long as that of Star A, what is the temperature of Star B (in K; don't write the units in the text box)?Why is it that radio telescopes need to be so larger or organized in arrays?