This playful and modern name is well suited to a media, electronics or transport organisation.
The name "eartht" has only six characters and just one syllable. One-syllable names are highly rare and very desirable. Leading companies using one syllable names include Nike, Chase and Path.
Eartht.com is a dot-com domain. Dot com domains are the most desirable top-level-domain in the world, famously used by websites like google.com. When most people think of a website, they think of a dot-com.