We have covered heat-sensitive mugs here in the past. The Constellation Mug is one of the geekiest ones yet. It has a bunch of well-known constellations that emerge before your eyes as you pour a hot drink into the mug. Includes:
- Ursa Major
- Ursa Minor
- Castor & Pollux
The Constellation Mug sets you back about $17. A pretty special gift for the geek in your life.