The discovery began with astronomer Henry Draper, who was a pioneer in stellar spectroscopy. When he died, his widow donated money to the Harvard College Observatory. There are hired a group of "computers", who studied the stellar spectra. One of employees classified the spectra by the of their . She ordered them . This scheme proved to shedding any understanding on the nature of stars. Annie Jump Cannon realized that she could reorganize the system into a more natural order. This left us with OBAFGKM. are the hottest and are the coolest
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Physics, 22.06.2019 00:30
Asap time is ! best answer gets compose at least one well-developed paragraph on the following: define the term concurrent powers, and give an example of a concurrent power of government.
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Physics, 22.06.2019 00:30
Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate
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Physics, 22.06.2019 18:30
Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton
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The discovery began with astronomer Henry Draper, who was a pioneer in stellar spectroscopy. When he...
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