Annette Tombaugh

Explanation: Annette Tombaugh, daughter of American astronomer Clyde Tombaugh who discovered Pluto in 1930, applauds as members of the New Horizons team announce that they are naming an area on Pluto after her father during a media briefing, Wednesday, July 15, 2015 at the Johns Hopkins University Applied Physics Laboratory (APL), Laurel, Maryland.

Pluto

Image credit: NASA/Bill Ingalls.