Around Earth and the inner solar system, for example, space is filled with dust particles that get lit up by the sun, creating a diffuse glow over the entire sky. That's important because it means the spacecraft is far from major sources of light contamination that make it impossible to detect any tiny light signal from the universe itself. It's now more than 4 billion miles from home - nearly 50 times farther away from the sun than the Earth is. New Horizons was originally designed to explore Pluto, but after whizzing past the dwarf planet in 2015, the intrepid spacecraft just kept going. The group has posted its work online, and it will soon appear in The Astrophysical Journal. Now, Lauer and other researchers with NASA's New Horizons space mission say they've finally been able to do it, using a spacecraft that's traveling far beyond the dwarf planet Pluto. It's a tough question that astronomers have tried to answer for decades. Science Pluto Has White-Capped Mountains, But Not Because There's Snow
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