Four classes of planetary systems

In our solar system, everything seems to be in order: The smaller rocky planets, such as Venus, Earth or Mars, orbit relatively close to our star. The large gas and ice giants, such as Jupiter, Saturn or Neptune, on the other ...

Picturing ruins: More than just a morbid fascination

Click on hashtag #abandoned on Instagram and you'll find more than 9 million posts. For hashtag #urbex, there are more than 11 million. It's a seemingly endless supply of haunting photographs of ruins—abandoned houses in ...

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