https://www.wusf.org/tags/ultima-thule Ultima Thule en-US Copyright Wed, 02 Jan 2019 21:32:48 GMT https://www.wusf.org/2019-01-02/images-reveal-a-snowman-at-the-frigid-outer-reaches-of-our-solar-system Scientists say Ultima Thule, a newly explored world out beyond Pluto, is a relic from our solar system's earliest days. Wed, 02 Jan 2019 21:32:48 GMT https://www.wusf.org/2019-01-02/images-reveal-a-snowman-at-the-frigid-outer-reaches-of-our-solar-system Nell Greenfieldboyce