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Photo of the Day
Finding ΜU69’s Location in Space, Argentina 2017
Explanation: How do we know where our next object is? By watching it pass in front of distant stars. MU69 will cast a tiny star-shadow on Earth when it passes in front of a star from our vantage point. But, exactly where on Earth that shadow is cast is dependent on exactly where MU69 is on the sky. The NASA New Horizons mission sent teams across the planet over the last few years to wait for just such crossing events to help determine exactly where MU69 is in space. This picture was taken by Kai Getrost in Argentina in 2017.
Image credit: Kai Getrost