Curious places in Puerto Rico
4 articles, each fact-checked and tied to a spot you can stand on.
A pulsar orbiting a white dwarf so closely that Einstein's equations are tested to extreme precision. Gravitational waves shrinking their orbit by 3mm per year.
Clouds of hydrogen gas spinning like galaxies but with no visible stars - cosmic darkness that shouldn't exist. Are these "dark galaxies" made almost entirely of dark matter, or galaxies that somehow failed to ignite?
In 1974 humanity broadcast a message to stars 25,000 light-years away. If anyone replies. We'll be long extinct before it arrives.
The question of why we've found no evidence of alien life despite high probability. Explanations range from the Great Filter to the Dark Forest hypothesis.
Prefer coordinates over lists? Every place here is a pin on the map.
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