How does the color change work?

The outer design is heat sensitive. Pour in a hot drink and the moon pattern shifts color within seconds. Cold drinks leave it unchanged.

Is it dishwasher safe?

No. Hand wash it to protect the heat-sensitive coating, which is the part most likely to wear out.

Yes, the ceramic mug is microwave safe. That is unusual for color-changing mugs, many of which are not.

14 oz, roughly a large standard coffee. It stands 3.5 inches tall.

Yes for a moon or space fan or a novelty gift. Skip it for someone who wants a low-maintenance everyday mug, since it needs hand washing.

It can. Some owners report the color effect weakening after repeated washing, so treat the coating gently.

At shopnasa.com, for $14.95, 17% under what the other stores charge, as of our latest check.

Rated 3.5 out of 5 from 13 ratings.

13 stores we checked sell it, including shopnasa.com, eBay, Etsy, Tea and Totally Gifts, Exploratorium.

$14.95at shopnasa.comChecked 2 h ago

17% under what the other stores charge

Compared across 13 stores. Prices are checked against each store and labelled with when.