Mark R. Showalter
... that American astronomer Mark R. Showalter has discovered five moons and three planetary rings in our solar system?
... that American <a href="./Astronomer" id="mwkQ" rel="mw:WikiLink" title="Astronomer">astronomer</a> <b id="mwkg"><a href="./Mark_R._Showalter" id="mwkw" rel="mw:WikiLink" title="Mark R. Showalter">Mark R. Showalter</a></b> has discovered five <a href="./Natural_satellite" id="mwlA" rel="mw:WikiLink" title="Natural satellite">moons</a> and three <a class="mw-redirect" href="./Planetary_ring" id="mwlQ" rel="mw:WikiLink" title="Planetary ring">planetary rings</a> in our solar system?