When protons and electrons in neutral hydrogen spin,they act like tiny magnets.
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Q12: The halo of the Galaxy is a
Q13: The Galaxy rotates like a solid disk,like
Q14: Flocculent spiral galaxies have spiral arms that
Q15: Stars in the disk of the Galaxy
Q16: The 21-cm emission is used mainly to
Q18: Visible light passes more easily though dust
Q19: The Sun takes about 220 million years
Q20: RR Lyrae variable stars are bigger,brighter and
Q21: In the 1790s,Sir William Herschel tried to
Q22: "Standard candles," which are important for finding
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