The following essay is reprinted with permission from The Conversation, an online publication covering the latest research. Space agencies and private companies already have advanced plans to send ...

Charles W. Dunnill does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

This article was originally published at The Conversation. The publication contributed the article to Space.com's Expert Voices: Op-Ed & Insights. Space agencies and private companies already have ...