Fuel up for a long night of observing with a hot beverage, and the planets of the Solar System will reveal themselves to you - literally! Mug design features representations of the eight major planets, with moons, facts, and figures that become visible when the mug is filled with hot liquid.
Mug holds 12 ounces, or 350 mL if you're feeling metric. Microwave safe, but not dishwasher safe.
I love the planet statistics which appear when there is warm fluid--for me, tea or hot chocolate--in the mug. They bring back memories of the first decade of my career as a planetary scientist, when I worked with all of the planets of the Solar System, including studying the rings of Uranus (which I helped discover), Jupiter (which we tried to see occult a star from Earth), Saturn, and Neptune (which we didn't find, but were detected by an occultation I predicted). When I broke my Solar System mug, I immediately bought a new one to take to Center for Astrophysics seminars for tea.