| 100% | PLUTO | 5 | Dwarf planet photographed by NASA's New Horizons in 2015 |
| 60% | CERES | 5 | Dwarf planet orbited by NASA's Dawn in 2015 |
| 58% | PLUTO | 5 | Dwarf planet photographed by the New Horizons probe |
| 29% | MARS | 4 | Planet that's being explored by two NASA rovers |
| 29% | MARS | 4 | Planet explored by NASA rovers |
| 29% | ERIS | 4 | Dwarf planet discovered in 2005 |
| 29% | DISC | 4 | Planet's shape in a book series by Terry Pratchett |
| 28% | CERES | 5 | Dwarf planet in the asteroid belt |
| 28% | PLUTO | 5 | Dwarf planet in the solar system |
| 28% | PLUTO | 5 | Dwarf planet in the Kuiper belt |
| 28% | MARS | 4 | Planet simulated by NASA on Mauna Loa |
| 28% | CECIL | 5 | Zimbabwean lion in 2015 news |
| 27% | ISS | 3 | Site used by NASA, in brief |
| 27% | AMAZON | 6 | Company that passed Walmart in 2015 as the world's largest retailer by market value |
| 27% | CERES | 5 | NASA's spacecraft Dawn began orbiting it in 2015 |
| 27% | ERIS | 4 | Largest dwarf planet in the solar system |
| 27% | TRITON | 6 | Moon photographed by Voyager 2 in 1989 |
| 27% | AMERICANPHAROAH | 15 | 3-year-old in 2015 sports news |
| 27% | XENA | 4 | Dwarf planet in the outer reaches of the solar system |
| 26% | ERIS | 4 | Most massive dwarf planet in the solar system |
| 26% | YANNI | 5 | Composer Chryssomallis, who wrote "Seven Billion Dreams" in 2015 for NASA's 15th anniversary of the ISS |
| 26% | IGOR | 4 | Frankenstein's assistant, portrayed by Daniel Radcliffe in the 2015 film "Victor Frankenstein" |
| 26% | PLUTO | 5 | It was reclassified as a dwarf planet in 2006 |
| 26% | DUCT | 4 | ___ tape was invited by NASA for use in space |
| 26% | ASHE | 4 | Arthur ___ Courage Award, won in 2015 by Caitlyn Jenner |
| 26% | PLUTO | 5 | Planet demoted to dwarf status in 2006 |
| 26% | THEDOLLHOUSE | 12 | Novel by 39-Across set in New York City's Barbizon Hotel (2 wds.) |
| 25% | VIKING | 6 | — 1, unmanned spacecraft sent to Mars by NASA in 1975 |
| 25% | DINNER | 6 | White House Correspondents ___ (event headlined in 2015 by Cecily Strong) |
| 25% | JUPITER | 7 | Planet impacted by a comet in July, 1994 |