9 epic discoveries scientists made in the solar system this year
Jan 1, 2016, 03:12 IST
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In 2015, we saw the world's first orbital rocket touch back down on the ground. We saw the beloved dwarf planet Pluto in exquisite detail. And an astronaut broke the record for the longest time spent in space.
We learned a lot about our own solar system this year, too, as NASA outlined in a recent blog post.
Here's a look at nine of the biggest discoveries we made in our celestial neighborhood in 2015.