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POPSWeird dark stars dotted early universe Quasars usually need the mass of a galaxy to form, and astronomers have been unable to explain how some quasars seemed to appear before galaxies had formed to make them. These 'dark stars' provide a means by which this may have happened.
3
POPSGood time to spot the Andromeda Galaxy "The light from that "little cloud" is actually the total accumulation of light from more than 400 billion stars. It is listed as Messier ("M") 31, in Charles Messier's famous catalogue: hazy objects resembling comets, but later proved to be galaxies, nebulae and star clusters. Here is the most distant object that can be seen with the unaided eye. "
10
POPSPeru Meteorite mystery solved I didn't realize the scale of the crater till I saw this picture with the people along the rim. That's as big as my entire yard! Other than the temporary sickness caused by the arsenic, the whole incident would have been very cool to see.
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POPSThis planet's a true survivor The speed of light, means the further away they are, the longer ago they happened. Great view of universal history....as far as we know.
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