Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
None of these are quite “Earth-like” though being either much hotter or much larger than the Earth. Source: with permission from the Planetary Habitability Laboratory/University of Puerto Rico at Arecibo.
