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Unformatted text preview: distance object?-Transitions produce unique pattern of emission/absorption lines for each element What are 3 basic categories of astronomical observations Imaging-use camera to take pictures-photometry. . measure amount and color (with filters) of light from object Spectroscopy -use spectrograph to separate light in detail into its different wavelengths (colors) Timing-measure how amount of light changes with time (sometimes in a fraction of a second) 11) want to know chemical compostiiton of a distant star. Most important info is. . The wavelengths of the spectral lines 26) planet is discovered by Doppler technique and is then discovered to have transits. In that case we can determine all of the following about planet exept Rotation period Newtons version of Keplers third law is used to find the masses of many distant objects. Thermail radiation= hotter objects emit more light at all frequencies and emit photons with a higher average energy Most missed mc questions....
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- Spring '06