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Planet Nine: A world that shouldn't exist
Earlier this year scientists presented evidence for Planet Nine, a Neptune-mass planet in an elliptical orbit 10 times farther from our Sun than Pluto. Since then theorists have puzzled over how this planet could end up in such a distant orbit. New research examines a number of scenarios and finds that most of them have low probabilities. Therefore, the presence of Planet Nine remains a bit of a mystery.
Microbes make tubular microtunnels on Earth and perhaps on Mars
Sea urchin's teeth inspire new design for space exploration device
Although boiling, water does shape Martian terrain
Three potentially habitable worlds found around nearby ultracool dwarf star
Unique fragment from Earth's formation returns after billions of years in cold storage
Don’t touch: How scientists study the reactions inside stars